In cold process soap making, a soap calculator is one of the most important formulation tools you can use. Oils and butters do not react with lye at the same rate because each fat has a different saponification value (SAP value). A soap calculator performs the precise calculation needed to determine the correct amount of sodium hydroxide required to fully convert your oils into soap while allowing you to set your superfat level for conditioning. Without this calculation, your soap could end up l