A lye calculator can help you figure out how much lye to use in your soap recipe. Either you are creating your own recipe or you are using a recipe that you found, it’s always best to first run through the recipe in a lye calculator to make sure that the ratio of the lye and the oils are correct. Lye calculators have become a necessary tool for soap makers, as they take some of the trial and error element out of the soap making process.
Below you’ll see the lye calculators that we are using and a few details about each one.
- Majestic Mountain Sage lye calculator is our favorite. It’s one of the oldest online lye calculators. It measures in ounces, grams and pounds and works for both sodium hydroxide and potassium hydroxide. The results give you a range of water amount to use, as well as a lye table with the superfat levels from 0-10% so that you don’t have to run through the calculations again for each superfat level.
- Bramble Berry lye calculator is very easy to use. You choose whether you are making solid or liquid soap, the type of measure unit you prefer, the amount of each oil you are using and the superfat level. It uses a fixed amount of water.
- SoapCalc is a very detailed lye calculator. It measures both sodium hydroxide and potassium hydroxide and it allows you to choose your water and superfat amount. What we like the most about this lye calculator is that it includes information about the soap properties and the fatty acid make-up of oils.
All three of the above lye calculators are valid and accurate. We use at least one of them when we make soap, because there are many recipes out there with the wrong amount or combination of ingredients. So, it’s best to do your calculations first.
Take a look and see which one fits you the most!