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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:70c44c6e-539a-4cc7-a4f6-2b38c13773b9,g:f18c5e7d-3559-495b-8daf-715eb6053b3d-->
<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="wlkp-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_Assets_d7a55905-8b04-4569-b5e7-80cd41d2121e" 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_PropertyPlantAndEquipmentNet_217ea0ab-ee74-4935-9f97-4db6645a8367" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_d7a55905-8b04-4569-b5e7-80cd41d2121e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_217ea0ab-ee74-4935-9f97-4db6645a8367" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCostsAndOtherAssets_ca69905f-9cff-42d5-9b01-c01eee1e9e52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredCostsAndOtherAssets"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_d7a55905-8b04-4569-b5e7-80cd41d2121e" xlink:to="loc_us-gaap_DeferredCostsAndOtherAssets_ca69905f-9cff-42d5-9b01-c01eee1e9e52" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_66fe12fe-b258-445c-9fc1-c53d3b6a71df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_d7a55905-8b04-4569-b5e7-80cd41d2121e" xlink:to="loc_us-gaap_AssetsCurrent_66fe12fe-b258-445c-9fc1-c53d3b6a71df" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_3109e93d-b51f-4e35-8de5-b546037c3b4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_d7a55905-8b04-4569-b5e7-80cd41d2121e" xlink:to="loc_us-gaap_Goodwill_3109e93d-b51f-4e35-8de5-b546037c3b4f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_15406b6a-4801-4716-81b1-6c5b4ca15558" 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_b1c45f9a-59eb-4430-936e-f4a099a64b5b" 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_15406b6a-4801-4716-81b1-6c5b4ca15558" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_b1c45f9a-59eb-4430-936e-f4a099a64b5b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_3d3dcf93-164f-426e-9ec3-f3da9e960b67" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_15406b6a-4801-4716-81b1-6c5b4ca15558" xlink:to="loc_us-gaap_AccountsPayableCurrent_3d3dcf93-164f-426e-9ec3-f3da9e960b67" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_4290926d-09a1-4deb-b58e-98f338ad9a79" 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_7e2e2242-bbce-46aa-a6f4-d47463a84f21" 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_4290926d-09a1-4deb-b58e-98f338ad9a79" xlink:to="loc_us-gaap_LiabilitiesCurrent_7e2e2242-bbce-46aa-a6f4-d47463a84f21" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebtNoncurrent_af829837-1bc3-4fab-b311-e87be6bcbb56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLongTermDebtNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4290926d-09a1-4deb-b58e-98f338ad9a79" xlink:to="loc_us-gaap_OtherLongTermDebtNoncurrent_af829837-1bc3-4fab-b311-e87be6bcbb56" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_b8f362eb-a862-4cc4-b4bc-5c2b6ff2e930" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4290926d-09a1-4deb-b58e-98f338ad9a79" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_b8f362eb-a862-4cc4-b4bc-5c2b6ff2e930" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_5535d51a-4b10-4ecc-870a-79c3a9c06dd0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_4290926d-09a1-4deb-b58e-98f338ad9a79" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_5535d51a-4b10-4ecc-870a-79c3a9c06dd0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_d7cfd5db-045f-400f-8dff-fbb64948e832" 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_PrepaidExpenseAndOtherAssetsCurrent_412d1108-596c-4104-8017-8c5675796ffb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_d7cfd5db-045f-400f-8dff-fbb64948e832" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_412d1108-596c-4104-8017-8c5675796ffb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_6b2d69c7-5d82-4566-91cf-69ca44877515" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_d7cfd5db-045f-400f-8dff-fbb64948e832" xlink:to="loc_us-gaap_ReceivablesNetCurrent_6b2d69c7-5d82-4566-91cf-69ca44877515" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_ReceivablesunderInvestmentManagementAgreementswithRelatedPartiesCurrent_fa07a133-0c5c-4767-9bb2-f35a92a8c730" xlink:href="wlkp-20251231.xsd#wlkp_ReceivablesunderInvestmentManagementAgreementswithRelatedPartiesCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_d7cfd5db-045f-400f-8dff-fbb64948e832" xlink:to="loc_wlkp_ReceivablesunderInvestmentManagementAgreementswithRelatedPartiesCurrent_fa07a133-0c5c-4767-9bb2-f35a92a8c730" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_c2729923-1153-4bb7-84e4-c9551e2e2601" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_d7cfd5db-045f-400f-8dff-fbb64948e832" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_c2729923-1153-4bb7-84e4-c9551e2e2601" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_2a153f08-c043-4448-8a75-bc93ba465803" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_d7cfd5db-045f-400f-8dff-fbb64948e832" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_2a153f08-c043-4448-8a75-bc93ba465803" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_fc426269-3232-4884-82ff-62de02a4cd0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryNet"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_d7cfd5db-045f-400f-8dff-fbb64948e832" xlink:to="loc_us-gaap_InventoryNet_fc426269-3232-4884-82ff-62de02a4cd0a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_bdd19574-2145-4190-ad09-0d87f1da71fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestInLimitedPartnerships_8eade878-950d-4dba-b0cf-a400531efebe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestInLimitedPartnerships"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_bdd19574-2145-4190-ad09-0d87f1da71fd" xlink:to="loc_us-gaap_MinorityInterestInLimitedPartnerships_8eade878-950d-4dba-b0cf-a400531efebe" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapital_a331e435-c137-4782-be95-10361cf80dfa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PartnersCapital"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_bdd19574-2145-4190-ad09-0d87f1da71fd" xlink:to="loc_us-gaap_PartnersCapital_a331e435-c137-4782-be95-10361cf80dfa" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapital_a29c79ce-79f1-47b0-817a-154391e4e1c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PartnersCapital"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccount_8c3e78c0-bdcf-47be-b128-f3724ac37549" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LimitedPartnersCapitalAccount"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapital_a29c79ce-79f1-47b0-817a-154391e4e1c5" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccount_8c3e78c0-bdcf-47be-b128-f3724ac37549" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralPartnersCapitalAccount_8433bdb7-e48e-4ce4-a0b8-605d77e73eea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralPartnersCapitalAccount"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PartnersCapital_a29c79ce-79f1-47b0-817a-154391e4e1c5" xlink:to="loc_us-gaap_GeneralPartnersCapitalAccount_8433bdb7-e48e-4ce4-a0b8-605d77e73eea" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_8051bd2f-b189-4ddb-a997-74138acd65b0" 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_Liabilities_200d9307-6053-48f9-982f-3b426f9237f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_8051bd2f-b189-4ddb-a997-74138acd65b0" xlink:to="loc_us-gaap_Liabilities_200d9307-6053-48f9-982f-3b426f9237f1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_5e11f996-0d02-45b1-97fe-ec948cc8216a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_8051bd2f-b189-4ddb-a997-74138acd65b0" xlink:to="loc_us-gaap_CommitmentsAndContingencies_5e11f996-0d02-45b1-97fe-ec948cc8216a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_1e778077-2c00-4261-a8f9-f6822503a6b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_8051bd2f-b189-4ddb-a997-74138acd65b0" xlink:to="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_1e778077-2c00-4261-a8f9-f6822503a6b1" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/ConsolidatedStatementsofOperations" xlink:type="simple" xlink:href="wlkp-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_Revenues_ed711be7-4660-4180-ae7b-731717a68652" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_3766c46d-1fc2-4a54-89cf-3c63571f4b7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_ed711be7-4660-4180-ae7b-731717a68652" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_3766c46d-1fc2-4a54-89cf-3c63571f4b7b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_61742a9e-aab8-4aa0-9199-c48a58af9d3c" 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_9f043030-7815-4881-a37a-42a9d0ec9785" 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_61742a9e-aab8-4aa0-9199-c48a58af9d3c" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_9f043030-7815-4881-a37a-42a9d0ec9785" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_313f39b0-a428-46c4-af25-a829f6d30df2" 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_61742a9e-aab8-4aa0-9199-c48a58af9d3c" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_313f39b0-a428-46c4-af25-a829f6d30df2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_232131aa-dff4-4790-88d2-94b227329ae3" 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_2dba26db-26e1-406c-a10d-6b819134beb2" 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_232131aa-dff4-4790-88d2-94b227329ae3" xlink:to="loc_us-gaap_OperatingIncomeLoss_2dba26db-26e1-406c-a10d-6b819134beb2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_86cc9a92-c190-4ffa-a98b-f9622c343d32" 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_232131aa-dff4-4790-88d2-94b227329ae3" xlink:to="loc_us-gaap_InterestExpenseNonoperating_86cc9a92-c190-4ffa-a98b-f9622c343d32" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_a41c05c1-7955-4bcb-b0a8-7bc08bf6a35d" 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_232131aa-dff4-4790-88d2-94b227329ae3" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_a41c05c1-7955-4bcb-b0a8-7bc08bf6a35d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_5472d785-72e3-40b8-a411-2aeb64ee1de8" 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_GrossProfit_17f0ca28-fa47-4b81-8777-1ad5faaeab1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_5472d785-72e3-40b8-a411-2aeb64ee1de8" xlink:to="loc_us-gaap_GrossProfit_17f0ca28-fa47-4b81-8777-1ad5faaeab1e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_018fba68-b58a-4499-a753-d9efa6bf2f68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_5472d785-72e3-40b8-a411-2aeb64ee1de8" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_018fba68-b58a-4499-a753-d9efa6bf2f68" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_07391975-be50-407c-aae0-e36eefb8eba3" 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_CostOfGoodsAndServicesSold_a3d3d4cc-f0b7-4592-bc49-17eca808b44d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_07391975-be50-407c-aae0-e36eefb8eba3" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_a3d3d4cc-f0b7-4592-bc49-17eca808b44d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_33b6a7d9-7294-449e-a27b-dd63e8602407" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_07391975-be50-407c-aae0-e36eefb8eba3" xlink:to="loc_us-gaap_Revenues_33b6a7d9-7294-449e-a27b-dd63e8602407" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_fc01b857-b393-414f-b2b1-79f459a088b7" 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_e785934d-0fbd-4143-81b6-74a4f5a32e15" 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_fc01b857-b393-414f-b2b1-79f459a088b7" xlink:to="loc_us-gaap_ProfitLoss_e785934d-0fbd-4143-81b6-74a4f5a32e15" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_305c0f53-ea1a-4f63-a7ac-cb42828b7e1a" 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_fc01b857-b393-414f-b2b1-79f459a088b7" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_305c0f53-ea1a-4f63-a7ac-cb42828b7e1a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/ConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="wlkp-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_NetCashProvidedByUsedInInvestingActivities_991a68b9-d9fd-4ddc-a87d-062aedca070e" 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_wlkp_InvestmentswithWestlakeundertheInvestmentManagementAgreement_25c4430b-3b34-48fa-a6bc-2bff2c4f927e" xlink:href="wlkp-20251231.xsd#wlkp_InvestmentswithWestlakeundertheInvestmentManagementAgreement"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_991a68b9-d9fd-4ddc-a87d-062aedca070e" xlink:to="loc_wlkp_InvestmentswithWestlakeundertheInvestmentManagementAgreement_25c4430b-3b34-48fa-a6bc-2bff2c4f927e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_d6e31717-6d43-4260-9035-c0096b50144f" 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_991a68b9-d9fd-4ddc-a87d-062aedca070e" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_d6e31717-6d43-4260-9035-c0096b50144f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_MaturitiesofinvestmentswithWestlakeundertheInvestmentManagementAgreement_951e3adf-a8cc-4bc6-9c0e-d75f21a8295b" xlink:href="wlkp-20251231.xsd#wlkp_MaturitiesofinvestmentswithWestlakeundertheInvestmentManagementAgreement"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_991a68b9-d9fd-4ddc-a87d-062aedca070e" xlink:to="loc_wlkp_MaturitiesofinvestmentswithWestlakeundertheInvestmentManagementAgreement_951e3adf-a8cc-4bc6-9c0e-d75f21a8295b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fb3159bc-9f3e-4d0b-a72b-d51f2fb723f1" 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_2a622229-099b-4b9b-855c-414c09e2de3f" 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_fb3159bc-9f3e-4d0b-a72b-d51f2fb723f1" xlink:to="loc_us-gaap_ProfitLoss_2a622229-099b-4b9b-855c-414c09e2de3f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_eddcc811-1f38-490a-ab5f-9b0ba6e5c178" 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_fb3159bc-9f3e-4d0b-a72b-d51f2fb723f1" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_eddcc811-1f38-490a-ab5f-9b0ba6e5c178" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets_7a9b064f-e326-4fc8-9b2e-33f829aeef6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnDispositionOfAssets"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fb3159bc-9f3e-4d0b-a72b-d51f2fb723f1" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets_7a9b064f-e326-4fc8-9b2e-33f829aeef6a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_59be9564-118a-401e-960f-7f28184b32d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fb3159bc-9f3e-4d0b-a72b-d51f2fb723f1" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_59be9564-118a-401e-960f-7f28184b32d4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_cc14d758-fe4a-4fdc-a236-424346aaaeac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fb3159bc-9f3e-4d0b-a72b-d51f2fb723f1" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_cc14d758-fe4a-4fdc-a236-424346aaaeac" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties_15424f04-c9d0-4377-939a-e6857a08945c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fb3159bc-9f3e-4d0b-a72b-d51f2fb723f1" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties_15424f04-c9d0-4377-939a-e6857a08945c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_576aa348-5aca-40d2-8761-833b0b7d45dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fb3159bc-9f3e-4d0b-a72b-d51f2fb723f1" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_576aa348-5aca-40d2-8761-833b0b7d45dc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_89baf27c-e38b-4799-9f0d-60c84cc9941b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fb3159bc-9f3e-4d0b-a72b-d51f2fb723f1" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_89baf27c-e38b-4799-9f0d-60c84cc9941b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_1de50b89-7038-4cd3-875e-122653d29a9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:calculationArc order="9" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fb3159bc-9f3e-4d0b-a72b-d51f2fb723f1" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_1de50b89-7038-4cd3-875e-122653d29a9f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_23b420cf-3c73-45eb-a9b1-8da3059e89cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fb3159bc-9f3e-4d0b-a72b-d51f2fb723f1" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_23b420cf-3c73-45eb-a9b1-8da3059e89cd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_f1f2ab9c-563c-4471-bd07-b10d00989ad1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet"/>
    <link:calculationArc order="11" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_fb3159bc-9f3e-4d0b-a72b-d51f2fb723f1" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_f1f2ab9c-563c-4471-bd07-b10d00989ad1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_fcac1e54-2661-4f07-864f-16e3b99f4b65" 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_NetCashProvidedByUsedInFinancingActivities_5f8231cf-176e-4daa-b83e-56d99667e7d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_fcac1e54-2661-4f07-864f-16e3b99f4b65" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_5f8231cf-176e-4daa-b83e-56d99667e7d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_9cdeff05-ff9a-41d6-ad9a-48f541776532" 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_fcac1e54-2661-4f07-864f-16e3b99f4b65" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_9cdeff05-ff9a-41d6-ad9a-48f541776532" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4fc248e8-03de-4a96-9f3f-4b99a587caf5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_fcac1e54-2661-4f07-864f-16e3b99f4b65" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_4fc248e8-03de-4a96-9f3f-4b99a587caf5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_e2ed5e49-bd31-418f-98bd-895663c7a58f" 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_DistributionMadeToLimitedPartnerCashDistributionsPaid_26628a07-d38b-4fe1-8782-504ae4c52987" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_e2ed5e49-bd31-418f-98bd-895663c7a58f" xlink:to="loc_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_26628a07-d38b-4fe1-8782-504ae4c52987" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsMinorityInterest_499d99af-e10e-4603-9c65-a7842a75c80e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividendsMinorityInterest"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_e2ed5e49-bd31-418f-98bd-895663c7a58f" xlink:to="loc_us-gaap_PaymentsOfDividendsMinorityInterest_499d99af-e10e-4603-9c65-a7842a75c80e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRelatedPartyDebt_41e9cc35-1bd9-414b-b934-9decd6905b81" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromRelatedPartyDebt"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_e2ed5e49-bd31-418f-98bd-895663c7a58f" xlink:to="loc_us-gaap_ProceedsFromRelatedPartyDebt_41e9cc35-1bd9-414b-b934-9decd6905b81" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfRelatedPartyDebt_473bf512-cd48-4bf9-8891-6aae2f7ef6e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfRelatedPartyDebt"/>
    <link:calculationArc order="4" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_e2ed5e49-bd31-418f-98bd-895663c7a58f" xlink:to="loc_us-gaap_RepaymentsOfRelatedPartyDebt_473bf512-cd48-4bf9-8891-6aae2f7ef6e6" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/AccountsReceivableThirdPartiesScheduleOfAccountsReceivableDetails" xlink:type="simple" xlink:href="wlkp-20251231.xsd#AccountsReceivableThirdPartiesScheduleOfAccountsReceivableDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/AccountsReceivableThirdPartiesScheduleOfAccountsReceivableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_b4f97d7a-aead-4c61-a24c-09c29e54ad07" 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_AccountsReceivableGrossCurrent_db82593e-0f44-4462-acf5-47c2ee3a7311" 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_ReceivablesNetCurrent_b4f97d7a-aead-4c61-a24c-09c29e54ad07" xlink:to="loc_us-gaap_AccountsReceivableGrossCurrent_db82593e-0f44-4462-acf5-47c2ee3a7311" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_7b7594a6-ff01-4d4b-b5a8-e26007c38226" 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_ReceivablesNetCurrent_b4f97d7a-aead-4c61-a24c-09c29e54ad07" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_7b7594a6-ff01-4d4b-b5a8-e26007c38226" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/InventoriesScheduleOfInventoryDetails" xlink:type="simple" xlink:href="wlkp-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_dfc8ae6e-14c3-4806-8bb5-df567e5fbd5d" 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_InventoryFinishedGoods_ab5b002a-0c74-4ba8-9590-e31d055deddc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryFinishedGoods"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_dfc8ae6e-14c3-4806-8bb5-df567e5fbd5d" xlink:to="loc_us-gaap_InventoryFinishedGoods_ab5b002a-0c74-4ba8-9590-e31d055deddc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWorkInProcessAndRawMaterials_70f3bdfb-4c11-4f8f-8041-d2334fc9ae42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InventoryWorkInProcessAndRawMaterials"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNet_dfc8ae6e-14c3-4806-8bb5-df567e5fbd5d" xlink:to="loc_us-gaap_InventoryWorkInProcessAndRawMaterials_70f3bdfb-4c11-4f8f-8041-d2334fc9ae42" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/PropertyPlantandEquipmentScheduleOfPropertyPlantAndEquipmentDetails" xlink:type="simple" xlink:href="wlkp-20251231.xsd#PropertyPlantandEquipmentScheduleOfPropertyPlantAndEquipmentDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/PropertyPlantandEquipmentScheduleOfPropertyPlantAndEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress_98f0de6f-1718-4f26-9790-9167765ebc98" xlink:href="wlkp-20251231.xsd#wlkp_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingsAndImprovementsGross_3d9a84a1-eea1-4b4f-b3af-29d2e8fdbccb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BuildingsAndImprovementsGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wlkp_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress_98f0de6f-1718-4f26-9790-9167765ebc98" xlink:to="loc_us-gaap_BuildingsAndImprovementsGross_3d9a84a1-eea1-4b4f-b3af-29d2e8fdbccb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentGross_e79fe383-2919-4a4d-a886-4869e291cbdf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MachineryAndEquipmentGross"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wlkp_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress_98f0de6f-1718-4f26-9790-9167765ebc98" xlink:to="loc_us-gaap_MachineryAndEquipmentGross_e79fe383-2919-4a4d-a886-4869e291cbdf" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentOther_1cbf95ee-13b0-4c6e-8fe9-1ba66373fda0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentOther"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wlkp_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress_98f0de6f-1718-4f26-9790-9167765ebc98" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentOther_1cbf95ee-13b0-4c6e-8fe9-1ba66373fda0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_6522df8a-6089-4db3-a120-bb98279de197" 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_ConstructionInProgressGross_b91002d5-baf5-428f-b389-0f12e220e463" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConstructionInProgressGross"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_6522df8a-6089-4db3-a120-bb98279de197" xlink:to="loc_us-gaap_ConstructionInProgressGross_b91002d5-baf5-428f-b389-0f12e220e463" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_PropertyPlantAndEquipmentNetExcludingConstructionInProgress_6d13ffc3-3807-401c-970a-3431e221995c" xlink:href="wlkp-20251231.xsd#wlkp_PropertyPlantAndEquipmentNetExcludingConstructionInProgress"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNet_6522df8a-6089-4db3-a120-bb98279de197" xlink:to="loc_wlkp_PropertyPlantAndEquipmentNetExcludingConstructionInProgress_6d13ffc3-3807-401c-970a-3431e221995c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_PropertyPlantAndEquipmentNetExcludingConstructionInProgress_b1d0ea79-855b-4430-9101-4c9ca340ee04" xlink:href="wlkp-20251231.xsd#wlkp_PropertyPlantAndEquipmentNetExcludingConstructionInProgress"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_f56438c5-d44a-497c-9518-6b2bea376c07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wlkp_PropertyPlantAndEquipmentNetExcludingConstructionInProgress_b1d0ea79-855b-4430-9101-4c9ca340ee04" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_f56438c5-d44a-497c-9518-6b2bea376c07" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress_a34221f3-887a-4f9e-896f-a6661055c217" xlink:href="wlkp-20251231.xsd#wlkp_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_wlkp_PropertyPlantAndEquipmentNetExcludingConstructionInProgress_b1d0ea79-855b-4430-9101-4c9ca340ee04" xlink:to="loc_wlkp_PropertyPlantAndEquipmentGrossExcludingConstructionInProgress_a34221f3-887a-4f9e-896f-a6661055c217" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/DeferredChargesandOtherAssetsScheduleOfIntangibleandOtherAssetsDetails" xlink:type="simple" xlink:href="wlkp-20251231.xsd#DeferredChargesandOtherAssetsScheduleOfIntangibleandOtherAssetsDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/DeferredChargesandOtherAssetsScheduleOfIntangibleandOtherAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCostsAndOtherAssets_2071724b-d237-4941-8285-1c937a3d7e5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredCostsAndOtherAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_TurnaroundCostsNet_eef3bcfb-0729-41f2-9d39-dd585f48f126" xlink:href="wlkp-20251231.xsd#wlkp_TurnaroundCostsNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredCostsAndOtherAssets_2071724b-d237-4941-8285-1c937a3d7e5b" xlink:to="loc_wlkp_TurnaroundCostsNet_eef3bcfb-0729-41f2-9d39-dd585f48f126" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_NoncurrentAssetsOtherNet_d3b36362-5c60-4830-99bb-5d39edec78ae" xlink:href="wlkp-20251231.xsd#wlkp_NoncurrentAssetsOtherNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredCostsAndOtherAssets_2071724b-d237-4941-8285-1c937a3d7e5b" xlink:to="loc_wlkp_NoncurrentAssetsOtherNet_d3b36362-5c60-4830-99bb-5d39edec78ae" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/IncomeTaxesScheduleOfTheProvisionForBenefitFromIncomeTaxesDetails" xlink:type="simple" xlink:href="wlkp-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_2a767571-25ca-4022-a9cf-3d0fbeefdf7a" 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_CurrentStateAndLocalTaxExpenseBenefit_71191dac-b881-4337-ad20-c9bcfc1d3df2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_2a767571-25ca-4022-a9cf-3d0fbeefdf7a" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_71191dac-b881-4337-ad20-c9bcfc1d3df2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_977fe8a6-5ea4-4fe5-af77-a347a6de9f26" 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_IncomeTaxExpenseBenefit_2a767571-25ca-4022-a9cf-3d0fbeefdf7a" xlink:to="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_977fe8a6-5ea4-4fe5-af77-a347a6de9f26" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/IncomeTaxesReconciliationOfTaxesComputedAtTheStatutoryRateToIncomeTaxExpenseDetails" xlink:type="simple" xlink:href="wlkp-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_8db9ee1f-8a2f-4689-bd95-c0ed3b52a51b" 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_9e99db21-2fd3-4d22-a281-864b1eb5c85a" 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_8db9ee1f-8a2f-4689-bd95-c0ed3b52a51b" xlink:to="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_9e99db21-2fd3-4d22-a281-864b1eb5c85a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_9d5da3af-535b-4de9-bd52-23d692c1722e" 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_8db9ee1f-8a2f-4689-bd95-c0ed3b52a51b" xlink:to="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_9d5da3af-535b-4de9-bd52-23d692c1722e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxExemptIncome_600c9253-78eb-49a6-afd0-f3b2751656ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationTaxExemptIncome"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_8db9ee1f-8a2f-4689-bd95-c0ed3b52a51b" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxExemptIncome_600c9253-78eb-49a6-afd0-f3b2751656ba" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c296b-eca7-7d5d-a8ec-ae5e38f70bf6" 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_019c296b-eca7-7fa0-8a76-f5bae5829458" 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_019c296b-eca7-7d5d-a8ec-ae5e38f70bf6" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_019c296b-eca7-7fa0-8a76-f5bae5829458" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_019c296b-eca7-7114-b8cf-ccadf3f08695" 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_019c296b-eca7-7d5d-a8ec-ae5e38f70bf6" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_019c296b-eca7-7114-b8cf-ccadf3f08695" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome_019c296b-eca7-7720-8baf-63c197ceff1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c296b-eca7-7d5d-a8ec-ae5e38f70bf6" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome_019c296b-eca7-7720-8baf-63c197ceff1e" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/IncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="simple" xlink:href="wlkp-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_DeferredTaxLiabilities_9eb4c795-2515-4c94-865a-08e6d67667dd" 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_DeferredIncomeTaxLiabilitiesNet_83ee7b63-0788-4fef-8f8d-fe3a81666362" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_9eb4c795-2515-4c94-865a-08e6d67667dd" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_83ee7b63-0788-4fef-8f8d-fe3a81666362" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/IncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails_1" xlink:type="simple" xlink:href="wlkp-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_810deb39-1a34-485b-9da0-9c3ab88aca7b" 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_DeferredTaxLiabilitiesPropertyPlantAndEquipment_2cedb5ae-414f-4712-b4ac-cecfa187dbe1" 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_DeferredTaxLiabilities_810deb39-1a34-485b-9da0-9c3ab88aca7b" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_2cedb5ae-414f-4712-b4ac-cecfa187dbe1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts_bd61a33a-790c-4984-92f4-6613491c36eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DeferredTaxLiabilities_810deb39-1a34-485b-9da0-9c3ab88aca7b" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts_bd61a33a-790c-4984-92f4-6613491c36eb" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.westlake.com/role/SegmentInformationDetails" xlink:type="simple" xlink:href="wlkp-20251231.xsd#SegmentInformationDetails"/>
  <link:calculationLink xlink:role="http://www.westlake.com/role/SegmentInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_ab412e38-213c-4da8-8b26-ef99f00346d7" 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_us-gaap_DepreciationDepletionAndAmortization_3b16716a-8b2f-47c3-91ad-b79e9794ea9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_ab412e38-213c-4da8-8b26-ef99f00346d7" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_3b16716a-8b2f-47c3-91ad-b79e9794ea9d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_wlkp_RawMaterialEnergyManufacturingAndLogisticsCosts_568e5c62-5a6b-495a-a952-90fbfa73aea1" xlink:href="wlkp-20251231.xsd#wlkp_RawMaterialEnergyManufacturingAndLogisticsCosts"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CostOfGoodsAndServicesSold_ab412e38-213c-4da8-8b26-ef99f00346d7" xlink:to="loc_wlkp_RawMaterialEnergyManufacturingAndLogisticsCosts_568e5c62-5a6b-495a-a952-90fbfa73aea1" xlink:type="arc"/>
  </link:calculationLink>
</link:linkbase>
