Cold Process Soap Calc & Lye Calculator

Use this calculator when you know your oil amounts and need to calculate the correct lye and water for your recipe.

Soapmaking Lye Calculator

Oil / Butter / Fat
Amount
% of Oils
Additive or Fragrance Oil Name
Amount
Basis
Add at least one oil with a valid weight, then click Calculate Recipe.

This calculator uses average reference saponification values and average oil profile data. Actual values can vary by supplier and lot. Always verify formulas before production and follow proper lye safety procedures.
Calculator by Master Maker Crafts · mastermakercrafts.com
Copyright 2026 Master Maker Crafts. All rights reserved. Calculator design, logic, and code may not be copied, reproduced, or distributed without written permission.

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