Soap making is a science at heart. When you add color and fragrance, it turns into an art. Each oil has its own saponification value, or the amount of lye it takes to turn 1 gram of oil into 1 gram of soap.

When we make cold process soap, it’s a mathematical formula that looks like this: (oil amount) x (SAP value) = lye amount needed. You can find SAP values on all our oil and butter product pages. An example is (10 oz. olive oil) x (.134) = 1.34 oz. lye. So, it takes 1.34 ounces of lye to turn 10 ounces of olive oil into soap.

Using the exact amount of lye you need to make the exact amount of soap with nothing leftover is a 0% superfat or lye discount. Many makers like to have some leftover oils in their recipe that aren’t bound to lye, which can be anywhere from a 1-20% superfat.

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