<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:81d18c42-215b-4463-be04-1e70ed94d42d,g:12525219-a0ac-42aa-82a5-00784f7673a4-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.westlake.com/role/ConsolidatedBalanceSheets" xlink:type="simple" xlink:href="wlk-20251231.xsd#ConsolidatedBalanceSheets"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_cd4e12ea-0c75-4071-9574-a698b48bab22" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_df3ebd6c-c152-4fc8-921b-58bc9d5c8690" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_cd4e12ea-0c75-4071-9574-a698b48bab22" xlink:to="loc_us-gaap_LiabilitiesCurrent_df3ebd6c-c152-4fc8-921b-58bc9d5c8690" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_e6d96671-bc54-4e80-ae87-1e48497ff08a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_cd4e12ea-0c75-4071-9574-a698b48bab22" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_e6d96671-bc54-4e80-ae87-1e48497ff08a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_5af3ddfe-a056-4b0f-911a-c9770f7633c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_cd4e12ea-0c75-4071-9574-a698b48bab22" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_5af3ddfe-a056-4b0f-911a-c9770f7633c0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_d7a3fd7c-3115-4491-8156-d6a24a915e36" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_cd4e12ea-0c75-4071-9574-a698b48bab22" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_d7a3fd7c-3115-4491-8156-d6a24a915e36" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_18a8c270-24ce-442c-bfa2-56cc1dda9d30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_cd4e12ea-0c75-4071-9574-a698b48bab22" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_18a8c270-24ce-442c-bfa2-56cc1dda9d30" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_bd005d2f-c1ed-4a12-89fe-b8b4a0b6e716" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_cd4e12ea-0c75-4071-9574-a698b48bab22" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_bd005d2f-c1ed-4a12-89fe-b8b4a0b6e716" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_e68fa3d4-0df4-4c50-82e5-5cac2e5c1789" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_5f318975-4f44-4b21-9e99-0265a1176da9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_e68fa3d4-0df4-4c50-82e5-5cac2e5c1789" xlink:to="loc_us-gaap_StockholdersEquity_5f318975-4f44-4b21-9e99-0265a1176da9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_415af54d-0c85-45dc-919c-7872fd2f2873" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_e68fa3d4-0df4-4c50-82e5-5cac2e5c1789" xlink:to="loc_us-gaap_MinorityInterest_415af54d-0c85-45dc-919c-7872fd2f2873" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_e2a83a3c-5eba-4748-9705-81d6eca401cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_8f3ee221-2b78-485e-872b-ced14ee2ceda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_e2a83a3c-5eba-4748-9705-81d6eca401cd" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_8f3ee221-2b78-485e-872b-ced14ee2ceda" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_b0ab258c-05ba-48c2-b719-66c1d420cbc3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_e2a83a3c-5eba-4748-9705-81d6eca401cd" xlink:to="loc_us-gaap_Liabilities_b0ab258c-05ba-48c2-b719-66c1d420cbc3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_1f806c04-f1eb-482f-aec5-5217607c49b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_e2a83a3c-5eba-4748-9705-81d6eca401cd" xlink:to="loc_us-gaap_CommitmentsAndContingencies_1f806c04-f1eb-482f-aec5-5217607c49b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_5e6d32bb-7168-4588-9b5b-b8ea0e153532" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_e1f22370-53fc-4c46-ab9c-c45b2db786ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_5e6d32bb-7168-4588-9b5b-b8ea0e153532" xlink:to="loc_us-gaap_PreferredStockValue_e1f22370-53fc-4c46-ab9c-c45b2db786ef" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_2955ab5f-e991-41a8-860e-4297bce15d86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_5e6d32bb-7168-4588-9b5b-b8ea0e153532" xlink:to="loc_us-gaap_CommonStockValue_2955ab5f-e991-41a8-860e-4297bce15d86" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_58cce6e8-2e35-4351-99f8-dbc81b932f51" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_5e6d32bb-7168-4588-9b5b-b8ea0e153532" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_58cce6e8-2e35-4351-99f8-dbc81b932f51" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_440a829d-933e-4102-95b8-0770cd41fae1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_5e6d32bb-7168-4588-9b5b-b8ea0e153532" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_440a829d-933e-4102-95b8-0770cd41fae1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_0d01a335-e429-480b-b9a8-f60c2d6e00c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValue"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_5e6d32bb-7168-4588-9b5b-b8ea0e153532" xlink:to="loc_us-gaap_TreasuryStockValue_0d01a335-e429-480b-b9a8-f60c2d6e00c3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_cb170825-256f-4b0a-ae8d-e805e8f78e52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_5e6d32bb-7168-4588-9b5b-b8ea0e153532" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_cb170825-256f-4b0a-ae8d-e805e8f78e52" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_fcb6cbf4-3a49-4887-b3f0-c77a085347d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_9b778dff-ef7a-4bbd-a035-6fc71817900d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_fcb6cbf4-3a49-4887-b3f0-c77a085347d5" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_9b778dff-ef7a-4bbd-a035-6fc71817900d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_6f01f096-cfe1-4e89-a161-e45823c78a9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_fcb6cbf4-3a49-4887-b3f0-c77a085347d5" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_6f01f096-cfe1-4e89-a161-e45823c78a9e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_b873643f-08af-4b1e-a654-0994de4f5d27" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_fcb6cbf4-3a49-4887-b3f0-c77a085347d5" xlink:to="loc_us-gaap_ReceivablesNetCurrent_b873643f-08af-4b1e-a654-0994de4f5d27" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_eddf0afe-8b68-4473-8250-61a2d7c6ae37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_fcb6cbf4-3a49-4887-b3f0-c77a085347d5" xlink:to="loc_us-gaap_InventoryNet_eddf0afe-8b68-4473-8250-61a2d7c6ae37" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019c34a3-7c5b-7f1d-adc5-1903177a46f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_fcb6cbf4-3a49-4887-b3f0-c77a085347d5" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019c34a3-7c5b-7f1d-adc5-1903177a46f9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_9b1da302-90b2-478e-8e48-50c9f61443ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_5272d333-f7c2-43ae-8d01-d96e4508f934" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_9b1da302-90b2-478e-8e48-50c9f61443ea" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_5272d333-f7c2-43ae-8d01-d96e4508f934" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_7b79e6ec-0f66-4948-b85d-fe71a5b44cca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_9b1da302-90b2-478e-8e48-50c9f61443ea" xlink:to="loc_us-gaap_LongTermDebtCurrent_7b79e6ec-0f66-4948-b85d-fe71a5b44cca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_6b2db8bf-0707-439e-b53a-f4aa16216f04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_9b1da302-90b2-478e-8e48-50c9f61443ea" xlink:to="loc_us-gaap_AccountsPayableCurrent_6b2db8bf-0707-439e-b53a-f4aa16216f04" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_160dee74-1e51-4fb0-b8bc-cafcb7b1a8ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_40255d4b-335a-4978-9ac2-860b94cc2383" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_160dee74-1e51-4fb0-b8bc-cafcb7b1a8ad" xlink:to="loc_us-gaap_AssetsCurrent_40255d4b-335a-4978-9ac2-860b94cc2383" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_23d6953a-e241-4a7e-8fab-b7780633a25c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_160dee74-1e51-4fb0-b8bc-cafcb7b1a8ad" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_23d6953a-e241-4a7e-8fab-b7780633a25c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_42be6bb6-92ba-4ddd-a7ae-f1a92acb9509" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_160dee74-1e51-4fb0-b8bc-cafcb7b1a8ad" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_42be6bb6-92ba-4ddd-a7ae-f1a92acb9509" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_7a945f91-4c17-46b3-bf68-7f05dc35c378" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_160dee74-1e51-4fb0-b8bc-cafcb7b1a8ad" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_7a945f91-4c17-46b3-bf68-7f05dc35c378" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_3bd15f68-a355-41ac-b28f-9b2237ad6e6b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_160dee74-1e51-4fb0-b8bc-cafcb7b1a8ad" xlink:to="loc_us-gaap_Goodwill_3bd15f68-a355-41ac-b28f-9b2237ad6e6b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsNet_59bf2438-a2bf-4321-b7cf-f0af4619f017" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherIntangibleAssetsNet"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_160dee74-1e51-4fb0-b8bc-cafcb7b1a8ad" xlink:to="loc_us-gaap_OtherIntangibleAssetsNet_59bf2438-a2bf-4321-b7cf-f0af4619f017" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_ed9d86fe-64c9-4833-87a5-4668d0b2945d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_160dee74-1e51-4fb0-b8bc-cafcb7b1a8ad" xlink:to="loc_us-gaap_EquityMethodInvestments_ed9d86fe-64c9-4833-87a5-4668d0b2945d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCostsAndOtherAssets_4a87a1dc-f3c7-4b1f-9803-62440a194768" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredCostsAndOtherAssets"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_160dee74-1e51-4fb0-b8bc-cafcb7b1a8ad" xlink:to="loc_us-gaap_DeferredCostsAndOtherAssets_4a87a1dc-f3c7-4b1f-9803-62440a194768" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/ConsolidatedStatementsOfOperations" xlink:type="simple" xlink:href="wlk-20251231.xsd#ConsolidatedStatementsOfOperations"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/ConsolidatedStatementsOfOperations" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_a89ad513-2799-4a75-9cb9-23c71a7af0e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_573b0de1-4138-4f07-a67a-09b59db04d4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_a89ad513-2799-4a75-9cb9-23c71a7af0e8" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_573b0de1-4138-4f07-a67a-09b59db04d4d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_41bf6ca6-77c6-4bf9-80fa-635f82b8ce84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_a89ad513-2799-4a75-9cb9-23c71a7af0e8" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_41bf6ca6-77c6-4bf9-80fa-635f82b8ce84" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_c74507c2-27b0-4474-b10d-5f0d8b81ca76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_a4748508-7bb5-4a79-801c-1c255d02f960" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_c74507c2-27b0-4474-b10d-5f0d8b81ca76" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_a4748508-7bb5-4a79-801c-1c255d02f960" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_a4fdcac6-3f39-4162-a6e4-374055e5c52a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_c74507c2-27b0-4474-b10d-5f0d8b81ca76" xlink:to="loc_us-gaap_GrossProfit_a4fdcac6-3f39-4162-a6e4-374055e5c52a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_9ce17f83-17d9-4a26-878a-dd0ea3f582ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_c74507c2-27b0-4474-b10d-5f0d8b81ca76" xlink:to="loc_us-gaap_AssetImpairmentCharges_9ce17f83-17d9-4a26-878a-dd0ea3f582ea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_123526c3-13f2-4fae-85e0-06f23c5d9f1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_c74507c2-27b0-4474-b10d-5f0d8b81ca76" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_123526c3-13f2-4fae-85e0-06f23c5d9f1e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlk_RestructuringTransactionAndIntegrationCost_8d5015e1-22a8-4d98-8a4e-fb96e6a94a0e" xlink:href="wlk-20251231.xsd#wlk_RestructuringTransactionAndIntegrationCost"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_c74507c2-27b0-4474-b10d-5f0d8b81ca76" xlink:to="loc_wlk_RestructuringTransactionAndIntegrationCost_8d5015e1-22a8-4d98-8a4e-fb96e6a94a0e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_668e31cc-7fbb-4031-a153-6a64b413ac6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_9cdb648a-8296-41fd-923e-bf9ff13afd32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_668e31cc-7fbb-4031-a153-6a64b413ac6f" xlink:to="loc_us-gaap_OperatingIncomeLoss_9cdb648a-8296-41fd-923e-bf9ff13afd32" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_569511d5-aea9-46c8-8f9a-2cf81c205e5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_668e31cc-7fbb-4031-a153-6a64b413ac6f" xlink:to="loc_us-gaap_InterestExpenseNonoperating_569511d5-aea9-46c8-8f9a-2cf81c205e5a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_82b3934c-1788-4a9d-9b14-a63d834965d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_668e31cc-7fbb-4031-a153-6a64b413ac6f" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_82b3934c-1788-4a9d-9b14-a63d834965d9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_5a4641f6-998d-4e5f-b32a-2004bd8c488f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_37513b49-0520-435f-9e9e-2a1f0dd20861" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_5a4641f6-998d-4e5f-b32a-2004bd8c488f" xlink:to="loc_us-gaap_Revenues_37513b49-0520-435f-9e9e-2a1f0dd20861" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_448d2c6b-e701-482f-9e02-06afdffab0c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_5a4641f6-998d-4e5f-b32a-2004bd8c488f" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_448d2c6b-e701-482f-9e02-06afdffab0c0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_d6ce957e-1817-40f5-b373-4a254c435201" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_22a62491-10e4-4362-b5c4-83b40052b877" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_d6ce957e-1817-40f5-b373-4a254c435201" xlink:to="loc_us-gaap_ProfitLoss_22a62491-10e4-4362-b5c4-83b40052b877" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_020569ef-ba38-4169-acf4-5395a2a55e60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_d6ce957e-1817-40f5-b373-4a254c435201" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_020569ef-ba38-4169-acf4-5395a2a55e60" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple" xlink:href="wlk-20251231.xsd#ConsolidatedStatementsOfComprehensiveIncome"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_ec51cac7-b2ae-4360-b9c2-da4867c3d4d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_cd771462-08cf-4bc0-b26c-9e3ad68d14ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_ec51cac7-b2ae-4360-b9c2-da4867c3d4d1" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_cd771462-08cf-4bc0-b26c-9e3ad68d14ba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_5a95639e-6dc9-4c5d-8535-186c31f77161" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_ec51cac7-b2ae-4360-b9c2-da4867c3d4d1" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_5a95639e-6dc9-4c5d-8535-186c31f77161" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_45d3c478-31dc-4f19-b9a9-95438d0b4fc5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_0f970ad7-4948-4437-ac52-ca7ce03aa0d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_45d3c478-31dc-4f19-b9a9-95438d0b4fc5" xlink:to="loc_us-gaap_ProfitLoss_0f970ad7-4948-4437-ac52-ca7ce03aa0d0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_9253c2e8-26ae-4ffb-8c89-17fedf7254e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_45d3c478-31dc-4f19-b9a9-95438d0b4fc5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_9253c2e8-26ae-4ffb-8c89-17fedf7254e2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_e8158c35-f537-451d-b60d-53dcf9fdb42f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax_2415727d-e174-4d12-b357-8bf754ea8308" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_e8158c35-f537-451d-b60d-53dcf9fdb42f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax_2415727d-e174-4d12-b357-8bf754ea8308" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent_24e89719-49e7-4591-82ab-93f896617ece" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_e8158c35-f537-451d-b60d-53dcf9fdb42f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent_24e89719-49e7-4591-82ab-93f896617ece" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_23328697-2e63-4ce3-8f01-c9c01760fa2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_e8158c35-f537-451d-b60d-53dcf9fdb42f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_23328697-2e63-4ce3-8f01-c9c01760fa2f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax_79da4d4a-c2c4-43fc-a23a-834080c4b586" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_e8158c35-f537-451d-b60d-53dcf9fdb42f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax_79da4d4a-c2c4-43fc-a23a-834080c4b586" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_019c34a8-71f4-793e-8ab7-d0673bafa565" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_e8158c35-f537-451d-b60d-53dcf9fdb42f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_019c34a8-71f4-793e-8ab7-d0673bafa565" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax_019c8cd7-115b-7aae-93cf-5d123e37f04b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_e8158c35-f537-451d-b60d-53dcf9fdb42f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax_019c8cd7-115b-7aae-93cf-5d123e37f04b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="simple" xlink:href="wlk-20251231.xsd#ConsolidatedStatementsOfCashFlows"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_f666b047-2691-463d-b564-dcd05e6bfd79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsMinorityInterest_7b217172-b91b-4153-9bd4-663c53de1b37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividendsMinorityInterest"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_f666b047-2691-463d-b564-dcd05e6bfd79" xlink:to="loc_us-gaap_PaymentsOfDividendsMinorityInterest_7b217172-b91b-4153-9bd4-663c53de1b37" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_8821bed6-7b7f-4ff4-b407-f23e3d61dae3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_f666b047-2691-463d-b564-dcd05e6bfd79" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_8821bed6-7b7f-4ff4-b407-f23e3d61dae3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_32bae9a8-b98c-4d41-a96e-cbe366e7579d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfDebt"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_f666b047-2691-463d-b564-dcd05e6bfd79" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_32bae9a8-b98c-4d41-a96e-cbe366e7579d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_2ee268c1-0f44-497b-9dfc-ed98f5738354" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_f666b047-2691-463d-b564-dcd05e6bfd79" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_2ee268c1-0f44-497b-9dfc-ed98f5738354" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_07f4dc81-2bf0-46f1-9b61-182eaeb6eafa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_f666b047-2691-463d-b564-dcd05e6bfd79" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_07f4dc81-2bf0-46f1-9b61-182eaeb6eafa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4645034a-3f49-4def-a10c-f5dd5e9631df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_f666b047-2691-463d-b564-dcd05e6bfd79" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_4645034a-3f49-4def-a10c-f5dd5e9631df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_874ba243-6219-42c2-ba98-6ddcac854d6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_50803a6f-f394-4945-b268-5efad7816428" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_874ba243-6219-42c2-ba98-6ddcac854d6c" xlink:to="loc_us-gaap_ProfitLoss_50803a6f-f394-4945-b268-5efad7816428" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_a0d100be-3fa4-43dd-b9e5-6a2bd2197416" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_874ba243-6219-42c2-ba98-6ddcac854d6c" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_a0d100be-3fa4-43dd-b9e5-6a2bd2197416" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_61c63320-3ce6-44e8-9240-655866492f15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_874ba243-6219-42c2-ba98-6ddcac854d6c" xlink:to="loc_us-gaap_ShareBasedCompensation_61c63320-3ce6-44e8-9240-655866492f15" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets_fef05ead-7241-4133-9d40-0ea9c69a904c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnDispositionOfAssets"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_874ba243-6219-42c2-ba98-6ddcac854d6c" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets_fef05ead-7241-4133-9d40-0ea9c69a904c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_11ee98ff-ba37-4dbe-9ad4-c9217aea05c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_874ba243-6219-42c2-ba98-6ddcac854d6c" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_11ee98ff-ba37-4dbe-9ad4-c9217aea05c5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_24a43ae4-f96d-4623-809e-3a9a0e6aad19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherOperatingActivitiesCashFlowStatement"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_874ba243-6219-42c2-ba98-6ddcac854d6c" xlink:to="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_24a43ae4-f96d-4623-809e-3a9a0e6aad19" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_875285a7-d0d4-4e5f-b8c9-1c2df9cbd92f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_874ba243-6219-42c2-ba98-6ddcac854d6c" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_875285a7-d0d4-4e5f-b8c9-1c2df9cbd92f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_881f0875-d828-4d39-9cad-05ff5f400327" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_874ba243-6219-42c2-ba98-6ddcac854d6c" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_881f0875-d828-4d39-9cad-05ff5f400327" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlk_IncreaseDecreaseInPrepaidExpensesAndOtherCurrentAssets_2dbb5b1e-67a0-4736-8e14-bab4ad4cd890" xlink:href="wlk-20251231.xsd#wlk_IncreaseDecreaseInPrepaidExpensesAndOtherCurrentAssets"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_874ba243-6219-42c2-ba98-6ddcac854d6c" xlink:to="loc_wlk_IncreaseDecreaseInPrepaidExpensesAndOtherCurrentAssets_2dbb5b1e-67a0-4736-8e14-bab4ad4cd890" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_3a39a030-9934-4d5e-b226-6c5c119ffc06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_874ba243-6219-42c2-ba98-6ddcac854d6c" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_3a39a030-9934-4d5e-b226-6c5c119ffc06" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_8a04807a-d4a9-4caf-9035-0b0404574b90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_874ba243-6219-42c2-ba98-6ddcac854d6c" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_8a04807a-d4a9-4caf-9035-0b0404574b90" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_aa551551-0b45-4410-9409-fb3b74e023ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet"/>
    <link:calculationArc order="12" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_874ba243-6219-42c2-ba98-6ddcac854d6c" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_aa551551-0b45-4410-9409-fb3b74e023ae" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_5e94b1fd-5756-4465-b1d5-11c08ac122fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:calculationArc order="13" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_874ba243-6219-42c2-ba98-6ddcac854d6c" xlink:to="loc_us-gaap_AssetImpairmentCharges_5e94b1fd-5756-4465-b1d5-11c08ac122fb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_3f8228cf-379e-474d-b57a-fedbee941e6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4e67fedb-b7df-4cc4-9c9f-18f81501657a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_3f8228cf-379e-474d-b57a-fedbee941e6c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4e67fedb-b7df-4cc4-9c9f-18f81501657a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_47fa52f4-df42-48e5-90f5-985326da399c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_3f8228cf-379e-474d-b57a-fedbee941e6c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_47fa52f4-df42-48e5-90f5-985326da399c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_ce903637-3f3c-4be2-acc1-fab346d82e82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_3f8228cf-379e-474d-b57a-fedbee941e6c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_ce903637-3f3c-4be2-acc1-fab346d82e82" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_ce8f4b2f-93ca-4748-ad28-5f78568442d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_3f8228cf-379e-474d-b57a-fedbee941e6c" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_ce8f4b2f-93ca-4748-ad28-5f78568442d4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_711c18ed-8e99-4fb6-b720-a92a9459f6f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlk_AdditionsToInvestmentsInUnconsolidatedSubsidiaries_2a89d4b2-a01c-4560-9683-7e7b5c086659" xlink:href="wlk-20251231.xsd#wlk_AdditionsToInvestmentsInUnconsolidatedSubsidiaries"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_711c18ed-8e99-4fb6-b720-a92a9459f6f3" xlink:to="loc_wlk_AdditionsToInvestmentsInUnconsolidatedSubsidiaries_2a89d4b2-a01c-4560-9683-7e7b5c086659" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_e250d810-2cd7-4be2-b536-930abc74d27d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_711c18ed-8e99-4fb6-b720-a92a9459f6f3" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_e250d810-2cd7-4be2-b536-930abc74d27d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_ed105a5b-279d-4127-b6a2-225da4a5f184" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_711c18ed-8e99-4fb6-b720-a92a9459f6f3" xlink:to="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_ed105a5b-279d-4127-b6a2-225da4a5f184" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_3e7b0171-ec09-4225-9653-877b4787c24a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_711c18ed-8e99-4fb6-b720-a92a9459f6f3" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities_3e7b0171-ec09-4225-9653-877b4787c24a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_019c48f2-a5ca-7d2d-a09a-7a5cd36751e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_711c18ed-8e99-4fb6-b720-a92a9459f6f3" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_019c48f2-a5ca-7d2d-a09a-7a5cd36751e3" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/AccountsReceivableScheduleOfAccountsReceivableDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#AccountsReceivableScheduleOfAccountsReceivableDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/AccountsReceivableScheduleOfAccountsReceivableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_2a84efd2-e20a-4138-8a74-9151bd02c9f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_b635d8b7-6723-4caa-bbf8-7c9803e6a2a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_2a84efd2-e20a-4138-8a74-9151bd02c9f1" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_b635d8b7-6723-4caa-bbf8-7c9803e6a2a8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesReceivable_5bb3f762-408a-4a54-b812-b0f6113f062b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxesReceivable"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_2a84efd2-e20a-4138-8a74-9151bd02c9f1" xlink:to="loc_us-gaap_IncomeTaxesReceivable_5bb3f762-408a-4a54-b812-b0f6113f062b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivablesNetCurrent_5929e787-d53c-45f8-be80-a1d559c834b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherReceivablesNetCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ReceivablesNetCurrent_2a84efd2-e20a-4138-8a74-9151bd02c9f1" xlink:to="loc_us-gaap_OtherReceivablesNetCurrent_5929e787-d53c-45f8-be80-a1d559c834b9" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_3d6308fa-7849-4c72-96af-2c9c8e91ed01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_a1f832a1-4aa7-480a-9d15-fa8cdb181014" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableGrossCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsReceivableNetCurrent_3d6308fa-7849-4c72-96af-2c9c8e91ed01" xlink:to="loc_us-gaap_AccountsReceivableGrossCurrent_a1f832a1-4aa7-480a-9d15-fa8cdb181014" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_e9590795-16cb-4d56-bd99-4372e76798e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsReceivableNetCurrent_3d6308fa-7849-4c72-96af-2c9c8e91ed01" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_e9590795-16cb-4d56-bd99-4372e76798e2" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/InventoriesScheduleOfInventoryDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#InventoriesScheduleOfInventoryDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/InventoriesScheduleOfInventoryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_8bad9a6c-f338-46b6-b8e3-88fb73277bac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_03f8cc38-78a4-4a55-a876-389704ee2253" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryFinishedGoodsNetOfReserves"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_8bad9a6c-f338-46b6-b8e3-88fb73277bac" xlink:to="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_03f8cc38-78a4-4a55-a876-389704ee2253" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWorkInProcessAndRawMaterialsNetOfReserves_c34058a1-9dcf-47d4-93a9-2447e17950a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryWorkInProcessAndRawMaterialsNetOfReserves"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_8bad9a6c-f338-46b6-b8e3-88fb73277bac" xlink:to="loc_us-gaap_InventoryWorkInProcessAndRawMaterialsNetOfReserves_c34058a1-9dcf-47d4-93a9-2447e17950a7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventorySuppliesNetOfReserves_860be76c-3d08-4e5d-be2b-387f9ed5d066" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventorySuppliesNetOfReserves"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_8bad9a6c-f338-46b6-b8e3-88fb73277bac" xlink:to="loc_us-gaap_InventorySuppliesNetOfReserves_860be76c-3d08-4e5d-be2b-387f9ed5d066" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/PropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#PropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/PropertyPlantAndEquipmentScheduleOfPropertyPlantAndEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_6d555a00-37b5-40ab-8c66-6588da66ab0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_a0f9a160-d2c6-4732-bd3c-827b66bbb085" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_6d555a00-37b5-40ab-8c66-6588da66ab0a" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_a0f9a160-d2c6-4732-bd3c-827b66bbb085" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_af77c2af-4998-4906-9341-573f3c60f581" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_6d555a00-37b5-40ab-8c66-6588da66ab0a" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_af77c2af-4998-4906-9341-573f3c60f581" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/LeasesDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#LeasesDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/LeasesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_148b57a8-c188-4190-b303-971352e2a6b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_223145fe-0f35-4a4a-9a3e-0b12d1213571" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_148b57a8-c188-4190-b303-971352e2a6b4" xlink:to="loc_us-gaap_OperatingLeaseCost_223145fe-0f35-4a4a-9a3e-0b12d1213571" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_ee3020c4-fb45-4074-ba19-aa840208d760" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermLeaseCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_148b57a8-c188-4190-b303-971352e2a6b4" xlink:to="loc_us-gaap_ShortTermLeaseCost_ee3020c4-fb45-4074-ba19-aa840208d760" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5fb72f7c-4b86-4d1e-a43a-df4791272099" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_13cf3409-e519-4295-9256-2f6f945b2e61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5fb72f7c-4b86-4d1e-a43a-df4791272099" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_13cf3409-e519-4295-9256-2f6f945b2e61" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_eeb3aed0-6ee4-4593-88d9-65bcac103c74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5fb72f7c-4b86-4d1e-a43a-df4791272099" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_eeb3aed0-6ee4-4593-88d9-65bcac103c74" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_c48e2e83-1386-458c-845b-62f38845ec82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5fb72f7c-4b86-4d1e-a43a-df4791272099" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_c48e2e83-1386-458c-845b-62f38845ec82" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_e84050c0-8da8-46bc-acec-e57ba694ab9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5fb72f7c-4b86-4d1e-a43a-df4791272099" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_e84050c0-8da8-46bc-acec-e57ba694ab9c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_5d4338ab-f28f-48a7-8947-049013456ccb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5fb72f7c-4b86-4d1e-a43a-df4791272099" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_5d4338ab-f28f-48a7-8947-049013456ccb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_1f292986-d68c-4b94-a515-1b72d9dd6471" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5fb72f7c-4b86-4d1e-a43a-df4791272099" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_1f292986-d68c-4b94-a515-1b72d9dd6471" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_6571bae3-8f05-4710-b236-ad87dfc0f745" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_8da6f344-9410-4415-b4a9-3cfa88d97f35" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_6571bae3-8f05-4710-b236-ad87dfc0f745" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_8da6f344-9410-4415-b4a9-3cfa88d97f35" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_99f2bfc4-fae1-42b9-8d89-c79f39a08787" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeaseLiability_6571bae3-8f05-4710-b236-ad87dfc0f745" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_99f2bfc4-fae1-42b9-8d89-c79f39a08787" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/LeasesDetails_1" xlink:type="simple" xlink:href="wlk-20251231.xsd#LeasesDetails_1"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/LeasesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_6027154d-83c6-4652-a000-6e92094bda07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_1839dd4c-201d-4ef3-8a1b-084da8021ef0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_6027154d-83c6-4652-a000-6e92094bda07" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_1839dd4c-201d-4ef3-8a1b-084da8021ef0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_ab835ac0-8ff1-45d4-b23d-925946711c24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_6027154d-83c6-4652-a000-6e92094bda07" xlink:to="loc_us-gaap_OperatingLeaseLiability_ab835ac0-8ff1-45d4-b23d-925946711c24" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/GoodwillandOtherIntangibleAssetsScheduleofFiniteLivedIntangibleAssetsDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#GoodwillandOtherIntangibleAssetsScheduleofFiniteLivedIntangibleAssetsDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/GoodwillandOtherIntangibleAssetsScheduleofFiniteLivedIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8408a201-a12b-4af6-8373-23a161683a57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_301dc62d-0ab1-4d41-84b2-30164ba22ca5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8408a201-a12b-4af6-8373-23a161683a57" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_301dc62d-0ab1-4d41-84b2-30164ba22ca5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_15b523b2-a83e-4331-bcde-c448823133ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8408a201-a12b-4af6-8373-23a161683a57" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_15b523b2-a83e-4331-bcde-c448823133ba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherFiniteLivedIntangibleAssetsGross_a09340cd-dff8-4436-ae6d-17b7978dbab6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherFiniteLivedIntangibleAssetsGross"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8408a201-a12b-4af6-8373-23a161683a57" xlink:to="loc_us-gaap_OtherFiniteLivedIntangibleAssetsGross_a09340cd-dff8-4436-ae6d-17b7978dbab6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedTradeNamesGross_3807a5d9-da72-40a4-89a1-01ee0fa6a05d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedTradeNamesGross"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8408a201-a12b-4af6-8373-23a161683a57" xlink:to="loc_us-gaap_FiniteLivedTradeNamesGross_3807a5d9-da72-40a4-89a1-01ee0fa6a05d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedLicenseAgreementsGross_1849e461-5a03-434b-805d-a48e03bd9c6d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedLicenseAgreementsGross"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8408a201-a12b-4af6-8373-23a161683a57" xlink:to="loc_us-gaap_FiniteLivedLicenseAgreementsGross_1849e461-5a03-434b-805d-a48e03bd9c6d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedCustomerRelationshipsGross_52068085-7dd8-40de-a968-89ced81ea414" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedCustomerRelationshipsGross"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_8408a201-a12b-4af6-8373-23a161683a57" xlink:to="loc_us-gaap_FiniteLivedCustomerRelationshipsGross_52068085-7dd8-40de-a968-89ced81ea414" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/AccountsPayableDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#AccountsPayableDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/AccountsPayableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_43b25f70-8b52-4796-ac5a-32fba96432f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableTradeCurrent_d74cbed6-e3d6-45a3-910a-fd4bdf58cf77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableTradeCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsPayableCurrent_43b25f70-8b52-4796-ac5a-32fba96432f3" xlink:to="loc_us-gaap_AccountsPayableTradeCurrent_d74cbed6-e3d6-45a3-910a-fd4bdf58cf77" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableCurrent_1479c58b-d37e-45f7-9551-1c6d021fd976" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesPayableCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccountsPayableCurrent_43b25f70-8b52-4796-ac5a-32fba96432f3" xlink:to="loc_us-gaap_NotesPayableCurrent_1479c58b-d37e-45f7-9551-1c6d021fd976" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/LongTermDebtScheduleOfLongTermDebtDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#LongTermDebtScheduleOfLongTermDebtDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/LongTermDebtScheduleOfLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_7d76ced7-9add-465c-9826-132675f1278e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_abd80213-dac8-45cd-9e03-2f1c69aeddee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_7d76ced7-9add-465c-9826-132675f1278e" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_abd80213-dac8-45cd-9e03-2f1c69aeddee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_1f4964a0-e368-4f0f-b136-ff4b70b591bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_7d76ced7-9add-465c-9826-132675f1278e" xlink:to="loc_us-gaap_LongTermDebtCurrent_1f4964a0-e368-4f0f-b136-ff4b70b591bb" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/LongTermDebtScheduleOfLongTermDebtDetails_1" xlink:type="simple" xlink:href="wlk-20251231.xsd#LongTermDebtScheduleOfLongTermDebtDetails_1"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/LongTermDebtScheduleOfLongTermDebtDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_a39c4df2-3d9b-4c08-8a11-164482600a9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_797c7682-7e5f-4d37-887f-d6eed2292e53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_a39c4df2-3d9b-4c08-8a11-164482600a9b" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_797c7682-7e5f-4d37-887f-d6eed2292e53" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_2381e70d-4a3f-41b8-b166-92de79513585" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LongTermDebt_a39c4df2-3d9b-4c08-8a11-164482600a9b" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_2381e70d-4a3f-41b8-b166-92de79513585" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/EmployeeBenefitsScheduleOfChangeInBenefitObligationandChangeInPlanAssetsDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#EmployeeBenefitsScheduleOfChangeInBenefitObligationandChangeInPlanAssetsDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/EmployeeBenefitsScheduleOfChangeInBenefitObligationandChangeInPlanAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_7cb83d23-6324-4add-8568-7293504695a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_68bed54c-96c2-4b41-9416-482e7d1efd75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_7cb83d23-6324-4add-8568-7293504695a0" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_68bed54c-96c2-4b41-9416-482e7d1efd75" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_99a40491-5b71-4af3-81eb-addf17e2eaf6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_7cb83d23-6324-4add-8568-7293504695a0" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_99a40491-5b71-4af3-81eb-addf17e2eaf6" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/EmployeeBenefitsScheduleOfAmountsRecognizedInTheConsolidatedBalanceSheetDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#EmployeeBenefitsScheduleOfAmountsRecognizedInTheConsolidatedBalanceSheetDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/EmployeeBenefitsScheduleOfAmountsRecognizedInTheConsolidatedBalanceSheetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent_75f7c950-fb83-42ec-8eea-38f89d105fe5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_6d08ac01-e5cd-4344-8c84-bd5bc0ad1296" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent_75f7c950-fb83-42ec-8eea-38f89d105fe5" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_6d08ac01-e5cd-4344-8c84-bd5bc0ad1296" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_56791553-0e26-409a-b310-7515422eb803" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent_75f7c950-fb83-42ec-8eea-38f89d105fe5" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_56791553-0e26-409a-b310-7515422eb803" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_d334db97-fc11-483d-9df3-709dc9bc6975" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent_75f7c950-fb83-42ec-8eea-38f89d105fe5" xlink:to="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_d334db97-fc11-483d-9df3-709dc9bc6975" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/EmployeeBenefitsScheduleOfNetBenefitCostsOtherChangesinPlanAssetsandBenefitObligationRecognizedInOtherComprehensiveIncomeDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#EmployeeBenefitsScheduleOfNetBenefitCostsOtherChangesinPlanAssetsandBenefitObligationRecognizedInOtherComprehensiveIncomeDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/EmployeeBenefitsScheduleOfNetBenefitCostsOtherChangesinPlanAssetsandBenefitObligationRecognizedInOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_dfa52b68-b26c-4579-a5ce-413e853e6ce9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_0aec4081-afc0-4bca-b53a-4b278153a916" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_dfa52b68-b26c-4579-a5ce-413e853e6ce9" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_0aec4081-afc0-4bca-b53a-4b278153a916" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_21fd4189-ce3e-4e7b-a03d-1b50c809f3ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_dfa52b68-b26c-4579-a5ce-413e853e6ce9" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_21fd4189-ce3e-4e7b-a03d-1b50c809f3ff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_53c5d49e-ff4c-4def-b579-25e240dbe377" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_dfa52b68-b26c-4579-a5ce-413e853e6ce9" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_53c5d49e-ff4c-4def-b579-25e240dbe377" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanOtherCosts_c11e69d8-37f5-4e05-9db3-cc1075094a58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanOtherCosts"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_dfa52b68-b26c-4579-a5ce-413e853e6ce9" xlink:to="loc_us-gaap_DefinedBenefitPlanOtherCosts_c11e69d8-37f5-4e05-9db3-cc1075094a58" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_65084a10-e3d1-41bc-952b-37a65e4a25d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_dfa52b68-b26c-4579-a5ce-413e853e6ce9" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_65084a10-e3d1-41bc-952b-37a65e4a25d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax_19156cbe-9fd3-4307-b2e0-59d309c9ddf6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_6422bfaf-22dd-4c79-bb28-2d3e77674946" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax_19156cbe-9fd3-4307-b2e0-59d309c9ddf6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax_6422bfaf-22dd-4c79-bb28-2d3e77674946" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlk_OtherComprehensiveIncomeLossDefinedBenefitPlanEffectonplanchangebeforetax_7b22568f-cbb1-42ba-b539-6c3c29cc4b14" xlink:href="wlk-20251231.xsd#wlk_OtherComprehensiveIncomeLossDefinedBenefitPlanEffectonplanchangebeforetax"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax_19156cbe-9fd3-4307-b2e0-59d309c9ddf6" xlink:to="loc_wlk_OtherComprehensiveIncomeLossDefinedBenefitPlanEffectonplanchangebeforetax_7b22568f-cbb1-42ba-b539-6c3c29cc4b14" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax_5545ebdd-5756-4e13-bc17-c21b84b8661a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax_19156cbe-9fd3-4307-b2e0-59d309c9ddf6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax_5545ebdd-5756-4e13-bc17-c21b84b8661a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax_019c34f3-9e6e-77f9-b41b-641b10dc340e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax_19156cbe-9fd3-4307-b2e0-59d309c9ddf6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax_019c34f3-9e6e-77f9-b41b-641b10dc340e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlk_OtherComprehensiveIncomeLossDefinedBenefitPlanForeignExchangeEffects_019c34f3-9e6e-72a2-8d33-b752417b4007" xlink:href="wlk-20251231.xsd#wlk_OtherComprehensiveIncomeLossDefinedBenefitPlanForeignExchangeEffects"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax_19156cbe-9fd3-4307-b2e0-59d309c9ddf6" xlink:to="loc_wlk_OtherComprehensiveIncomeLossDefinedBenefitPlanForeignExchangeEffects_019c34f3-9e6e-72a2-8d33-b752417b4007" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax_92a2fd63-0c8e-440f-bd60-c882142b193f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax_7412bd64-4ca0-4ccf-a7b9-195304544e49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax_92a2fd63-0c8e-440f-bd60-c882142b193f" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossNetGainLossBeforeTax_7412bd64-4ca0-4ccf-a7b9-195304544e49" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_c345256d-36a2-44b2-984d-3219f2c0f6c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AmountRecognizedInNetPeriodicBenefitCostAndOtherComprehensiveIncomeLossBeforeTax_92a2fd63-0c8e-440f-bd60-c882142b193f" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_c345256d-36a2-44b2-984d-3219f2c0f6c2" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/IncomeTaxesComponentsOfIncomeLossBeforeIncomeTaxesDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#IncomeTaxesComponentsOfIncomeLossBeforeIncomeTaxesDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/IncomeTaxesComponentsOfIncomeLossBeforeIncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5f196eac-36b1-444a-954b-673c3026f31e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_0cb5c319-dfdc-4e0a-bb3a-34bb9ebf0025" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5f196eac-36b1-444a-954b-673c3026f31e" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic_0cb5c319-dfdc-4e0a-bb3a-34bb9ebf0025" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_89cd33ba-0f4b-4ec1-b976-e3f7be1ac5fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_5f196eac-36b1-444a-954b-673c3026f31e" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign_89cd33ba-0f4b-4ec1-b976-e3f7be1ac5fb" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/IncomeTaxesScheduleOfTheProvisionForBenefitFromIncomeTaxesDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#IncomeTaxesScheduleOfTheProvisionForBenefitFromIncomeTaxesDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/IncomeTaxesScheduleOfTheProvisionForBenefitFromIncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_092a4552-cda2-4f90-871f-465ab3f46dee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_217e52f1-d02e-4204-8c84-3aac24ab5cf0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_092a4552-cda2-4f90-871f-465ab3f46dee" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_217e52f1-d02e-4204-8c84-3aac24ab5cf0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_fa0deb49-9875-44ea-b826-ecd879e6df95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_092a4552-cda2-4f90-871f-465ab3f46dee" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_fa0deb49-9875-44ea-b826-ecd879e6df95" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_b552f2e4-b5d8-48bc-ad5c-180f36d5587c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_7ad4d579-bff2-4173-8127-a92ee27b37b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_b552f2e4-b5d8-48bc-ad5c-180f36d5587c" xlink:to="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_7ad4d579-bff2-4173-8127-a92ee27b37b0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_a8458ffd-49ab-4497-8046-abc1ebb0bf4a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_b552f2e4-b5d8-48bc-ad5c-180f36d5587c" xlink:to="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_a8458ffd-49ab-4497-8046-abc1ebb0bf4a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_7b69b233-1ddd-49e1-8296-5c235a506238" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_b552f2e4-b5d8-48bc-ad5c-180f36d5587c" xlink:to="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_7b69b233-1ddd-49e1-8296-5c235a506238" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_c8035560-b62d-43c9-b1a3-a8e33cfa7b32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentFederalTaxExpenseBenefit_fce14823-25eb-4414-84dd-5d4fdfbe470f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrentFederalTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_c8035560-b62d-43c9-b1a3-a8e33cfa7b32" xlink:to="loc_us-gaap_CurrentFederalTaxExpenseBenefit_fce14823-25eb-4414-84dd-5d4fdfbe470f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_b6aa9cb3-6df9-4d80-b200-eae439f1293a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_c8035560-b62d-43c9-b1a3-a8e33cfa7b32" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_b6aa9cb3-6df9-4d80-b200-eae439f1293a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentForeignTaxExpenseBenefit_5767f4cb-3c2f-44c3-b4e8-50b28ea0a693" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrentForeignTaxExpenseBenefit"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_c8035560-b62d-43c9-b1a3-a8e33cfa7b32" xlink:to="loc_us-gaap_CurrentForeignTaxExpenseBenefit_5767f4cb-3c2f-44c3-b4e8-50b28ea0a693" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/IncomeTaxesReconciliationOfTaxesComputedAtTheStatutoryRateToIncomeTaxExpenseDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#IncomeTaxesReconciliationOfTaxesComputedAtTheStatutoryRateToIncomeTaxExpenseDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/IncomeTaxesReconciliationOfTaxesComputedAtTheStatutoryRateToIncomeTaxExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_ae32c38b-0bd8-4f61-a5b7-3e3c1238155b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_8d195e0f-bcd6-4dab-978d-b85f9b4de893" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ae32c38b-0bd8-4f61-a5b7-3e3c1238155b" xlink:to="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_8d195e0f-bcd6-4dab-978d-b85f9b4de893" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_0c08bc9f-2581-4df4-9465-29d580ab0c07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ae32c38b-0bd8-4f61-a5b7-3e3c1238155b" xlink:to="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_0c08bc9f-2581-4df4-9465-29d580ab0c07" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_73afcb12-383d-4b6d-86d8-6cc7658ea5ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ae32c38b-0bd8-4f61-a5b7-3e3c1238155b" xlink:to="loc_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_73afcb12-383d-4b6d-86d8-6cc7658ea5ac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_dc825689-e9e5-4acf-af31-0282befbf6c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationOtherAdjustments"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ae32c38b-0bd8-4f61-a5b7-3e3c1238155b" xlink:to="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_dc825689-e9e5-4acf-af31-0282befbf6c3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_ff3785e4-af04-4c0d-b83c-c695b62ed1f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ae32c38b-0bd8-4f61-a5b7-3e3c1238155b" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_ff3785e4-af04-4c0d-b83c-c695b62ed1f2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxCredits_a9993a08-bbfb-4635-8440-f790eb7886ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationTaxCredits"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ae32c38b-0bd8-4f61-a5b7-3e3c1238155b" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxCredits_a9993a08-bbfb-4635-8440-f790eb7886ed" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses_ab3c1dcc-fd64-4456-89ad-f355ed564cf8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ae32c38b-0bd8-4f61-a5b7-3e3c1238155b" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses_ab3c1dcc-fd64-4456-89ad-f355ed564cf8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_277474e8-158e-4adf-aa62-6801cf612389" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ae32c38b-0bd8-4f61-a5b7-3e3c1238155b" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_277474e8-158e-4adf-aa62-6801cf612389" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxContingencies_efffe60a-ca29-45ab-a45b-b66c313bce67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationTaxContingencies"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ae32c38b-0bd8-4f61-a5b7-3e3c1238155b" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxContingencies_efffe60a-ca29-45ab-a45b-b66c313bce67" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense_21d5f58b-a5ed-4fa2-bdff-465f8d47fb02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ae32c38b-0bd8-4f61-a5b7-3e3c1238155b" xlink:to="loc_us-gaap_IncomeTaxReconciliationMinorityInterestIncomeExpense_21d5f58b-a5ed-4fa2-bdff-465f8d47fb02" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlk_EffectiveIncomeTaxRateReconciliationUncertainIncomeTaxPositions_019c3488-0b28-79b5-8c1b-6c0e20f73414" xlink:href="wlk-20251231.xsd#wlk_EffectiveIncomeTaxRateReconciliationUncertainIncomeTaxPositions"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ae32c38b-0bd8-4f61-a5b7-3e3c1238155b" xlink:to="loc_wlk_EffectiveIncomeTaxRateReconciliationUncertainIncomeTaxPositions_019c3488-0b28-79b5-8c1b-6c0e20f73414" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_019c3488-0b28-79fd-ab7c-03931132f32e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_ae32c38b-0bd8-4f61-a5b7-3e3c1238155b" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_019c3488-0b28-79fd-ab7c-03931132f32e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c3482-2c8d-7c58-af5c-9a5c0f139932" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_019c3482-2c8d-75ee-8030-0ebee6cef843" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c3482-2c8d-7c58-af5c-9a5c0f139932" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_019c3482-2c8d-75ee-8030-0ebee6cef843" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_019c3482-2c8d-747e-92ac-8030da3d85c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c3482-2c8d-7c58-af5c-9a5c0f139932" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_019c3482-2c8d-747e-92ac-8030da3d85c6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_019c3482-2c8d-70ae-b3b4-e1f0ee2781bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c3482-2c8d-7c58-af5c-9a5c0f139932" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_019c3482-2c8d-70ae-b3b4-e1f0ee2781bb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_019c3482-2c8d-723a-8d2c-7e91f132cc3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c3482-2c8d-7c58-af5c-9a5c0f139932" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_019c3482-2c8d-723a-8d2c-7e91f132cc3e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_019c3482-2c8d-76b6-bd05-ff4e6b533496" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c3482-2c8d-7c58-af5c-9a5c0f139932" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_019c3482-2c8d-76b6-bd05-ff4e6b533496" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits_019c3482-2c8d-75f5-8a12-c0437c3fe1ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c3482-2c8d-7c58-af5c-9a5c0f139932" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits_019c3482-2c8d-75f5-8a12-c0437c3fe1ce" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses_019c3482-2c8d-7959-af4c-a5c312aeb8b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c3482-2c8d-7c58-af5c-9a5c0f139932" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses_019c3482-2c8d-7959-af4c-a5c312aeb8b6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther_019c3482-2c8d-7612-bf43-0b284a7f7b31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c3482-2c8d-7c58-af5c-9a5c0f139932" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther_019c3482-2c8d-7612-bf43-0b284a7f7b31" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies_019c3482-2c8d-75ab-9619-9fe5767ff327" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c3482-2c8d-7c58-af5c-9a5c0f139932" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies_019c3482-2c8d-75ab-9619-9fe5767ff327" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense_019c3482-2c8d-7254-8644-f17bce010000" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense"/>
    <link:calculationArc order="10" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c3482-2c8d-7c58-af5c-9a5c0f139932" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense_019c3482-2c8d-7254-8644-f17bce010000" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/IncomeTaxesIncomeTaxesPaidDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#IncomeTaxesIncomeTaxesPaidDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/IncomeTaxesIncomeTaxesPaidDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_019c348c-3562-7a84-9ee1-4b8ef7f06a06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidFederalAfterRefundReceived_019c348c-3562-75f4-9854-fdc9426c3d78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPaidFederalAfterRefundReceived"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxesPaidNet_019c348c-3562-7a84-9ee1-4b8ef7f06a06" xlink:to="loc_us-gaap_IncomeTaxPaidFederalAfterRefundReceived_019c348c-3562-75f4-9854-fdc9426c3d78" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived_019c348c-3562-79a6-8d1f-b1c494109f1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxesPaidNet_019c348c-3562-7a84-9ee1-4b8ef7f06a06" xlink:to="loc_us-gaap_IncomeTaxPaidStateAndLocalAfterRefundReceived_019c348c-3562-79a6-8d1f-b1c494109f1b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidForeignAfterRefundReceived_019c348c-3562-726b-b1ca-1b1bb02eb194" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPaidForeignAfterRefundReceived"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxesPaidNet_019c348c-3562-7a84-9ee1-4b8ef7f06a06" xlink:to="loc_us-gaap_IncomeTaxPaidForeignAfterRefundReceived_019c348c-3562-726b-b1ca-1b1bb02eb194" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/IncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#IncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/IncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_eccae722-4457-4b58-83d4-975cf51d372d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_6a4779b1-0663-476f-8567-b660484a76f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_eccae722-4457-4b58-83d4-975cf51d372d" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_6a4779b1-0663-476f-8567-b660484a76f8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets_9d7c1050-dbdd-4d59-9080-a5b1eb7e0f24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_eccae722-4457-4b58-83d4-975cf51d372d" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets_9d7c1050-dbdd-4d59-9080-a5b1eb7e0f24" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlk_DeferredTaxLiabilitiesOperatingLeaseRightofUseAssets_57e76849-5c0a-4439-812d-c3bc4447ff30" xlink:href="wlk-20251231.xsd#wlk_DeferredTaxLiabilitiesOperatingLeaseRightofUseAssets"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_eccae722-4457-4b58-83d4-975cf51d372d" xlink:to="loc_wlk_DeferredTaxLiabilitiesOperatingLeaseRightofUseAssets_57e76849-5c0a-4439-812d-c3bc4447ff30" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts_30b96987-2f64-4762-a680-5a925b586a8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_eccae722-4457-4b58-83d4-975cf51d372d" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts_30b96987-2f64-4762-a680-5a925b586a8a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther_12211bdd-0e75-4068-a935-04f123f94098" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxLiabilitiesOther"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_eccae722-4457-4b58-83d4-975cf51d372d" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOther_12211bdd-0e75-4068-a935-04f123f94098" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlk_DeferredTaxLiabilitiesParentsBasisInConsolidatedPartnerships_2946a0bb-5fa4-43ef-8bd2-45c6400befa6" xlink:href="wlk-20251231.xsd#wlk_DeferredTaxLiabilitiesParentsBasisInConsolidatedPartnerships"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_eccae722-4457-4b58-83d4-975cf51d372d" xlink:to="loc_wlk_DeferredTaxLiabilitiesParentsBasisInConsolidatedPartnerships_2946a0bb-5fa4-43ef-8bd2-45c6400befa6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates_0e7b1038-8874-48cc-9fb7-c456f0b94771" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredIncomeTaxLiabilities_eccae722-4457-4b58-83d4-975cf51d372d" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates_0e7b1038-8874-48cc-9fb7-c456f0b94771" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilities_850806ec-d76f-4d2f-89a0-1f9708c3716d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_ac689438-4fbe-4804-87b4-60613401f8d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_850806ec-d76f-4d2f-89a0-1f9708c3716d" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_ac689438-4fbe-4804-87b4-60613401f8d2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_ea7c17b7-73c1-4eea-a3af-629b1c1481c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_850806ec-d76f-4d2f-89a0-1f9708c3716d" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_ea7c17b7-73c1-4eea-a3af-629b1c1481c5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_2c6cadc6-dbc8-45f6-9b2e-dbe7bbdd0ba1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlk_DeferredTaxAssetsOperatingLeaseLiabilities_55740496-f311-4ec2-9db8-96aa5594cdfd" xlink:href="wlk-20251231.xsd#wlk_DeferredTaxAssetsOperatingLeaseLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_2c6cadc6-dbc8-45f6-9b2e-dbe7bbdd0ba1" xlink:to="loc_wlk_DeferredTaxAssetsOperatingLeaseLiabilities_55740496-f311-4ec2-9db8-96aa5594cdfd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_06a04ef2-1410-456b-98a0-88695bd9868c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsTaxCreditCarryforwards"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_2c6cadc6-dbc8-45f6-9b2e-dbe7bbdd0ba1" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxCreditCarryforwards_06a04ef2-1410-456b-98a0-88695bd9868c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsInventory_2c12f9ce-ad09-43b4-81e8-a7820e3802ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsInventory"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_2c6cadc6-dbc8-45f6-9b2e-dbe7bbdd0ba1" xlink:to="loc_us-gaap_DeferredTaxAssetsInventory_2c12f9ce-ad09-43b4-81e8-a7820e3802ff" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions_5d9f5bce-8977-4a65-b7ad-f0fcabbbb39b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_2c6cadc6-dbc8-45f6-9b2e-dbe7bbdd0ba1" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions_5d9f5bce-8977-4a65-b7ad-f0fcabbbb39b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_ce2534e8-bdb4-4c6b-b269-a67f9fb5562e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsOther"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_2c6cadc6-dbc8-45f6-9b2e-dbe7bbdd0ba1" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_ce2534e8-bdb4-4c6b-b269-a67f9fb5562e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment_5b99ecd7-03e2-480b-8ff2-1310b5b96179" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_2c6cadc6-dbc8-45f6-9b2e-dbe7bbdd0ba1" xlink:to="loc_us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment_5b99ecd7-03e2-480b-8ff2-1310b5b96179" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities_df82832c-5336-450d-8f89-177437604c56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_2c6cadc6-dbc8-45f6-9b2e-dbe7bbdd0ba1" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities_df82832c-5336-450d-8f89-177437604c56" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_ea7c1f60-3297-43fa-b129-4c6ca27338ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxAssetsGross_2c6cadc6-dbc8-45f6-9b2e-dbe7bbdd0ba1" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_ea7c1f60-3297-43fa-b129-4c6ca27338ae" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/IncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails_1" xlink:type="simple" xlink:href="wlk-20251231.xsd#IncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails_1"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/IncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilities_f4917da3-5fba-4ae7-a553-52d09d6fa0e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_7773f3ab-94e6-4944-8d4b-6cb2491d48ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_f4917da3-5fba-4ae7-a553-52d09d6fa0e6" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilities_7773f3ab-94e6-4944-8d4b-6cb2491d48ec" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_733240be-5994-424b-80f9-03656f207384" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_f4917da3-5fba-4ae7-a553-52d09d6fa0e6" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_733240be-5994-424b-80f9-03656f207384" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_c13a1d46-a97f-4c43-aa0b-472f3343d544" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_f4917da3-5fba-4ae7-a553-52d09d6fa0e6" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_c13a1d46-a97f-4c43-aa0b-472f3343d544" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/EarningsandDividendsperShareScheduleOfNetIncomeAttributableToCommonStockholdersDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#EarningsandDividendsperShareScheduleOfNetIncomeAttributableToCommonStockholdersDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/EarningsandDividendsperShareScheduleOfNetIncomeAttributableToCommonStockholdersDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wlk_NetIncomeLossAvailableToCommonStockholders_2935f131-d48f-4de2-8d7b-72a50b00e2de" xlink:href="wlk-20251231.xsd#wlk_NetIncomeLossAvailableToCommonStockholders"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_e895ae4b-c4cb-49af-8f04-a9cd9bbd4122" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wlk_NetIncomeLossAvailableToCommonStockholders_2935f131-d48f-4de2-8d7b-72a50b00e2de" xlink:to="loc_us-gaap_NetIncomeLoss_e895ae4b-c4cb-49af-8f04-a9cd9bbd4122" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted_520f68c5-4d9a-46cc-873e-f93ca22b3adf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wlk_NetIncomeLossAvailableToCommonStockholders_2935f131-d48f-4de2-8d7b-72a50b00e2de" xlink:to="loc_us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted_520f68c5-4d9a-46cc-873e-f93ca22b3adf" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/EarningsandDividendsperShareReconciliationOfDenominatorForBasicAndDilutedEarningsLossPerShareDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#EarningsandDividendsperShareReconciliationOfDenominatorForBasicAndDilutedEarningsLossPerShareDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/EarningsandDividendsperShareReconciliationOfDenominatorForBasicAndDilutedEarningsLossPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_fc8d6493-717e-4ed5-a291-8828813fd83f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_4ba9af50-25f5-4a67-8f2b-51d24f1c4649" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_fc8d6493-717e-4ed5-a291-8828813fd83f" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_4ba9af50-25f5-4a67-8f2b-51d24f1c4649" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_931cfa1a-3b39-4e73-b2d7-e4744f1585b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_fc8d6493-717e-4ed5-a291-8828813fd83f" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_931cfa1a-3b39-4e73-b2d7-e4744f1585b1" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/SegmentandGeographicInformationSegmentReportingInformationDetails" xlink:type="simple" xlink:href="wlk-20251231.xsd#SegmentandGeographicInformationSegmentReportingInformationDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/SegmentandGeographicInformationSegmentReportingInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wlk_TotalSellingGeneralAndAdministrativeExpenses_d520fa15-a990-429f-af2e-3e410da43191" xlink:href="wlk-20251231.xsd#wlk_TotalSellingGeneralAndAdministrativeExpenses"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlk_DepreciationAndAmortizationSGA_53cd72f8-e48a-44e4-b741-7af2ffe1e19c" xlink:href="wlk-20251231.xsd#wlk_DepreciationAndAmortizationSGA"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wlk_TotalSellingGeneralAndAdministrativeExpenses_d520fa15-a990-429f-af2e-3e410da43191" xlink:to="loc_wlk_DepreciationAndAmortizationSGA_53cd72f8-e48a-44e4-b741-7af2ffe1e19c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlk_RestructuringTransactionAndIntegrationRelatedCosts_e7076402-b6b5-4ef1-bfd1-ed32aa086848" xlink:href="wlk-20251231.xsd#wlk_RestructuringTransactionAndIntegrationRelatedCosts"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wlk_TotalSellingGeneralAndAdministrativeExpenses_d520fa15-a990-429f-af2e-3e410da43191" xlink:to="loc_wlk_RestructuringTransactionAndIntegrationRelatedCosts_e7076402-b6b5-4ef1-bfd1-ed32aa086848" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlk_SellingGeneralAndAdministrativeExpenses_af7c576f-8b28-4fc5-901b-f06f90886255" xlink:href="wlk-20251231.xsd#wlk_SellingGeneralAndAdministrativeExpenses"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wlk_TotalSellingGeneralAndAdministrativeExpenses_d520fa15-a990-429f-af2e-3e410da43191" xlink:to="loc_wlk_SellingGeneralAndAdministrativeExpenses_af7c576f-8b28-4fc5-901b-f06f90886255" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlk_ImpairmentOfGoodwillAndLongLivedAssets_883da60d-6c2c-4dde-9564-1d090ad38263" xlink:href="wlk-20251231.xsd#wlk_ImpairmentOfGoodwillAndLongLivedAssets"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wlk_TotalSellingGeneralAndAdministrativeExpenses_d520fa15-a990-429f-af2e-3e410da43191" xlink:to="loc_wlk_ImpairmentOfGoodwillAndLongLivedAssets_883da60d-6c2c-4dde-9564-1d090ad38263" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_58aaa66e-b63a-4659-9724-f68f562d274d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlk_RawMaterialEnergyAndManufacturingCosts_a583d1d1-6951-4dde-b8c8-6b165747dc7c" xlink:href="wlk-20251231.xsd#wlk_RawMaterialEnergyAndManufacturingCosts"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_58aaa66e-b63a-4659-9724-f68f562d274d" xlink:to="loc_wlk_RawMaterialEnergyAndManufacturingCosts_a583d1d1-6951-4dde-b8c8-6b165747dc7c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlk_DepreciationAndAmortizationSegmentExpenses_314e15b0-8701-45ec-9268-09309f463f84" xlink:href="wlk-20251231.xsd#wlk_DepreciationAndAmortizationSegmentExpenses"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_58aaa66e-b63a-4659-9724-f68f562d274d" xlink:to="loc_wlk_DepreciationAndAmortizationSegmentExpenses_314e15b0-8701-45ec-9268-09309f463f84" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
