Soap Making Calculators
Free soap making calculators for lye amounts, oil ratios, superfat percentage, and batch sizing.
Essential tools for cold process and hot process soapers.
Soap Bar Yield from Mold Volume Calculator
Calculate bars yielded from any soap mold by volume and bar size. Get cubic-inch yield, bars per loaf, and recipe scaling for cold-process and melt-and-pour.
Soap Superfat Percentage Effect Calculator
Calculate how superfat percentage affects soap hardness, lather, and skin feel. Get cleansing, conditioning, and bubble values from superfat lye discount.
Soap Colorant Dosage Calculator
Calculate soap colorant dosage per pound of oil for cold and hot process soap. Returns grams of mica, oxide, clay, or botanical for target color intensity.
Milk Soap Temperature Calculator
Calculate lye concentration and milk temperature for cold-process milk soaps using goat, coconut, or oat milk. Prevents scorching with step-by-step guidance.
Palm-Free Soap Recipe Calculator
Calculate a palm-free soap recipe from batch size in oz or grams. Returns oil weights for coconut, castor, olive, and shea butter with lye and water amounts.
Soap Cure Time Tracker Calculator
Calculate cold process soap cure time from dominant oils, humidity, and bar thickness. Returns minimum and optimal cure weeks for common soap recipes.
Soap Essential Oil Blend Calculator
Calculate essential oil amounts for cold process soap from batch weight and fragrance percent. Returns oil weights with top, middle, and base notes.
Soap Fragrance Oil Blend Calculator
Calculate fragrance oil amounts for soap blends using top, middle, and base note ratios. Returns grams of each oil for any batch at 3-6% fragrance load.
Soap Hardness Index Calculator
Calculate soap hardness index, cleansing, and conditioning scores from oil percentages using SAP values. Returns hardness out of 100 and longevity prediction.
Soap Water Discount Calculator
Calculate water discount for cold process soap to speed cure time and prevent glycerin rivers. Returns water weight at 5%, 10%, 15%, and 20% discount.
Soap Batch Scaler Calculator
Scale any soap recipe up or down by weight. Enter your original recipe and target batch size to get proportional ingredient amounts.
Soap Making Lye Calculator
Calculate the exact amount of lye (NaOH or KOH) needed for cold process or hot process soap based on your oil blend and superfat percentage.