Soap Superfat Calculator
Calculate the actual superfat percentage and excess oil in your soap batch based on oil weight, lye amount, and SAP value.
Inputs
oz
oz
%
Results
Excess Oil (Superfat)
1.63 oz
Actual Superfat
5.09%
Oil Saponified by Lye30.37 oz
Ideal Lye for Target SF4.1 oz
Lye Adjustment Needed0 oz
How to Use This Calculator
- Enter total oil weight and the actual lye (NaOH) amount used.
- Set the SAP value for your oil blend and your target superfat percentage.
- Review Excess Oil (superfat), Actual Superfat (%), and Saponified Oil.
- Higher superfat (8–10%) produces a more moisturizing but softer bar with shorter shelf life.
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