About

Three promises

The most trusted free lye calculator on the web. Every number explained, every oil value cited to a published range and a named source, no login, no ads on the calculator, fast on a phone with wet hands.

A formulator's workbench, not a recipe locker. Coming next: saved recipes with versions, a batch log with cure tracking, fragrance and allergen compliance, cost per bar, labels. Priced by capability, never by row count.

Every product a soaper actually makes. Bar, liquid, cream and shave soap first; then syndet bars, lotions, bath bombs, lip balm and candles on the same engine.

Two pledges

Portability. Your recipes are yours: import from anywhere, export everything, in open formats, free, forever.

Billing you can trust. When paid tiers arrive you will always see what you have and what you paid, and you will be able to refund yourself.

Open by design

The ingredient database is licensed ODbL and built only from primary documents. The formula library is MIT. If you run a blog, a supply shop or another tool, you may use both, with attribution.

What this is not

Not a safety assessment, not a regulatory filing, and not a substitute for weighing your lye on a good scale. Verify any recipe you did not calculate yourself, and treat compliance documents produced here as drafts for your assessor.