About this calculator

SAP (saponification) value gives g of NaOH per g of oil. Olive 0.134, coconut 0.190, shea 0.128. Always run a 5% superfat for skin-safe bars.

Frequently asked questions

What does the Cold-Process Soap Lye Calculator do?

Sodium hydroxide (NaOH) needed for a cold-process soap batch. SAP (saponification) value gives g of NaOH per g of oil. Olive 0.134, coconut 0.190, shea 0.128. Always run a 5% superfat for skin-safe bars.

Is the Cold-Process Soap Lye Calculator free to use?

Yes. Every calculator on Calcurly.com is free, works in your browser without sign-up, and can be embedded on your own website.

How accurate is the Cold-Process Soap Lye Calculator?

Results are calculated in real time using industry-standard formulas. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified soap making professional before committing to a purchase or a job.

What inputs does the Cold-Process Soap Lye Calculator need?

Enter values for: Olive oil (g), Coconut oil (g), Shea butter (g), Superfat %. Sensible defaults are pre-filled where possible so you can start with a single change.

Can I embed the Cold-Process Soap Lye Calculator on my own website?

Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcurly.com.