Calculator / NaOH cold process
Turn a good idea into a clear formula.
Build a bar from source-linked SAP values. This first release supports NaOH cold-process bars only.
Always wear proper safety gear.
Step 01
Choose your ingredients
Enter the weight of each oil in grams or ounces. Their sum determines the formula size, NaOH, and liquid.
Enter weights first; then you can adjust percentages against that total.
IngredientWeight (g)
Choose an ingredient above to begin.
Total oils · 0.0%0.0 g · 0.00 oz
Step 02
Choose your mixing liquid
Automatic starting estimate: Liquid is approximately 22% of the complete batch before saponification (oils + NaOH + fragrance + liquid), not 22% of oils alone. Oil SAP values and superfat determine the NaOH amount, assuming 100% sodium hydroxide purity. Fragrance adds to batch weight and changes this liquid estimate slightly, but never the NaOH amount. This is our approximation of a typical liquid share, not a verified supplier formula or a recipe-specific optimum. Check the supplier’s sodium hydroxide purity and follow a tested recipe.
Safety first. Slowly add NaOH to the measured liquid, never liquid to NaOH. Wear eye protection, gloves, and long sleeves, and work with ventilation. Milk mixtures need careful temperature control.
Step 03 / optional
Add your fragrance
Choose a fragrance from the menu. Its calculated amount follows your oil units (g); when oil percentages are selected, fragrance amounts use grams.
Are you adding fragrance to this batch?
You can leave it unscented, or choose a fragrance and let the calculator set the amount.
Total fragrance0.00 g
Step 04
Check your formula
Validate oil percentages, NaOH calculations, and fragrance amounts before printing or saving. Supplier IFRA rates are screened only when you select a documented product or enter a matching rate; missing limits hold automatic fragrance amounts at zero.