A free soap and lye calculator for cold and hot process soap, plus one place to keep your recipes, plan your batches and track every cure.
Exact lye and water for cold or hot process soap. NaOH or KOH, any superfat, and three ways to set water. The amounts update as you change the oils.
How the soap calculator works
Hardness, cleansing, conditioning and lather against their ideal ranges, labelled In range, Low or High.
Save your recipes, sort them into folders, compare several side by side, and export them as a PDF.
Schedule batches, track how long each has been curing, and see what is ready to use.
Save your fragrance oils once with the IFRA limit from your supplier, and get a warning when a recipe goes over it.
Example: 70% olive oil and 30% coconut oil at 5% superfat and 33% lye concentration needs 142.3 g of sodium hydroxide and 288.9 g of water for 1000 g of oils.
Free to use while LyeLab App is in beta.
Yes. Choose your oils and their percentages, pick NaOH or KOH, set your superfat, and it works out exactly how much lye and water to weigh out. The amounts update as you change the recipe.
Yes. When you start a recipe you choose cold process or hot process, and you get exact lye and water for either. The cure time estimate is shorter for hot process.
Three ways: as a percentage of the oils, as a lye concentration, or as a water to lye ratio. Use whichever your recipe or teacher uses.
Yes. It runs in your browser on phone, tablet and computer, and you can add it to your home screen so it opens full screen like an app.
Sodium and potassium hydroxide are caustic. Wear gloves and eye protection, add lye to water, never the reverse, and check every recipe before you make it.