Soap & Lye Calculator

Full oil blend — lye, water, FO, fatty acid breakdown & print-ready recipe. Wear gloves and eye protection. Always test small first.

Batch Settings

Percentages below scale to this weight.

NaOH: 95–100%, KOH: ~90%

0–5% typical. Check IFRA.

Results
Theoretical Lye
Actual Lye (w/ superfat + purity)
Water
Water : Lye Ratio
Fragrance Oil
Total Batch Weight
Batch Property Estimates

Based on fatty acid profiles. Oils without FA data are excluded.

Fatty Acid Breakdown

% of your oil blend for oils with FA data.

Oil Blend

Percentages must total 100%

0.00% / 100%
Oil / Butter % Weight NaOH SAP KOH SAP
Total 0.00% 0.00
Lye (NaOH/KOH) is caustic and dangerous. Always add lye to water — never water to lye. Wear gloves and eye protection. Weigh precisely. These values are estimates — verify with multiple sources before production.