There are several soap making lye calculators online and they are free to use. I also checked the Google Play Store and found dozens of apps available. Some sites are called "soap calculators" rather than "lye calculators." Of the many lye calculators online, I've usedBrambleberry.comandSoa...
Ultimately the decision to use or not use palm oil to make lye soap is a personal one. I used palm oil in this cold process soap recipe as I have a lot of it still in my soapmaking arsenal. It also makes a great bar of soap solely on its own. (So, if you haven’t tried it...