Lye Calculator
Calculate NaOH lye and water for cold process soap using oil weight, SAP value, and superfat.
Inputs
Formula: Oil Weight × SAP Value × (1 - Superfat)
Results
Enter values and click Calculate Now.
How to Use the Lye Calculator
The Lye Calculator helps you estimate materials and measurements for candle & soap making projects using the lye calculator. This tool uses the formula Oil Weight × SAP Value × (1 - Superfat) and covers related topics such as saponification, superfatting, cold process, hot process, sodium hydroxide.
Why This Candle & Soap Making Calculator Is Useful
Accurate estimation reduces waste, avoids mid-project shortages, and improves budgeting. Whether you are searching for soap calculator, soap making calculator, lye calculator for soap, sap calculator, this page provides a fast and practical calculation workflow. The calculator also supports common standards and concepts such as sap values, lye safety, superfat percentage, water to lye ratio.
Key Concepts and Standards
This calculator references industry standards and entities including Sodium Hydroxide (Chemical compound), Potassium Hydroxide (Chemical compound), Saponification (Chemical reaction), SoapCalc (Software/Tool). Understanding these terms helps you make accurate calculations: saponification value, sodium hydroxide (NaOH), potassium hydroxide (KOH), superfat percentage, liquid soap, cold process soap making.
Related Terms and Concepts
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Frequently Asked Questions
What is a soap calculator?+
A soap calculator determines the exact amount of lye (NaOH or KOH) and water needed for your oil recipe. It uses saponification values for each oil to ensure complete saponification with your chosen superfat.
How do you calculate how much lye to use in soap?+
Lye = Total Oil Weight × SAP Value × (1 - Superfat%). For 32 oz olive oil (SAP 0.134) at 5% superfat: 32 × 0.134 × 0.95 = 4.07 oz NaOH. Always use a reliable SAP value.
Why do I need a lye calculator for soap making?+
Each oil has a different saponification value. Using the wrong amount of lye creates soap that is either too harsh (lye-heavy) or too soft/oily (under-saponified). Precise calculation ensures safe, quality soap.
What is a good lye to water ratio for cold process soap?+
Common ratios: 2:1 water to lye (33% lye concentration) or 2.5:1. For beginners, 2.5:1 is easier to work with. For advanced soapers, 2:1 gives faster trace and shorter cure time.
How much lye per pound of oil for soap making?+
Varies by oil: Olive oil: 0.134 × 16 × 0.95 = 2.04 oz NaOH. Coconut oil: 0.183 × 16 × 0.95 = 2.78 oz. Palm oil: 0.141 × 16 × 0.95 = 2.14 oz. Always calculate per oil.
What happens if you use too much lye in soap?+
Lye-heavy soap is harsh, irritating, and can burn skin. It has a high pH (above 10). Always test with pH strips. If soap is lye-heavy, it should not be used. Rebatch or discard.
How do you calculate superfat in soap?+
Superfat = Extra oil left unsaponified. At 5% superfat: Lye = Oil × SAP × 0.95. Higher superfat = milder soap but softer bar. 3-5% is standard for cold process. 8-10% for luxury soaps.
What is the formula for saponification?+
Saponification: Fat/Oil + NaOH → Soap + Glycerin. The SAP value tells how much NaOH is needed to saponify 1 gram of oil. Each oil has a unique SAP value based on its fatty acid profile.
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