About SoapCalcPro
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SoapCalcPro is a free toolkit for home soap makers and small-batch producers. We built it because we were frustrated with clunky, ad-heavy lye calculators that required signups or didn't work on mobile.
Every calculator on this site runs entirely in your browser — no account, no data stored, no server calls. Enter your oils, get your numbers, go make soap.
What We Offer
- Lye Calculator — NaOH and KOH amounts for 20 common oils, adjustable superfat and water ratio
- Fragrance Calculator — fragrance oil amounts by usage rate and batch size
- Batch Scaler — scale any recipe up or down while keeping ratios intact
- Candle Calculator — wax, fragrance, and dye amounts for container candles
- Cost Calculator — per-bar cost breakdown for pricing your soap
- Burn Time Calculator — estimated candle burn time by container and wick size
Safety First
Lye is a caustic chemical that requires care and respect. All our guides include proper safety information alongside the recipes and techniques. If you're new to soap making, start with our Lye Safety Guide before your first batch.
Contact
Have a question, found a bug, or want to suggest a feature? Use the contact form — we read every message.