Soap Lye Calculator — NaOH & KOH

Free soap lye calculator for NaOH and KOH recipes

Use FormuMate's soap calculator to work out precise lye and liquid amounts for cold process and hot process soap. Build a recipe from your oil blend, adjust superfat, choose your water setting, and export the result when you are ready to save it.

Review hardness, cleansing, conditioning, bubbly lather, creamy lather, iodine, and INS before you make the batch. Save recipes, export them to PDF or Excel, and send finished calculations to the AI assistant for formulation feedback.

Common questions

This soap calculator supports NaOH and KOH recipes, cold process and hot process soapmaking, superfat adjustments, liquid ratio adjustments, and common soapmaking oils and fats.

The calculator is free to use and supports exporting finished results after calculation.