This Lye Calculator is intended for experienced soapmakers. Please provide the following information, after pressing the calculate button your browser will display the results. Superfat values of 0% (full saponification NOT RECOMMENDED) and 10% are automatically calculated along with the value you enter. Sodium Hydroxide (NaOH) and Potassium Hydroxide (KOH) are both calculated. To make changes close the popup window, make any changes and re-calculate.

Use the Re-Size option to automatically adjust your recipe to the proper batch size for Ye Olde Soap Shoppe molds. Have fun experimenting!