9 CALCULATORS
Soap calculators
Cold process, hot process and melt-and-pour. Run your oils through the lye calculator, discount your water, resize the recipe to your mould, then price the bar so the market stall actually pays.
Lye & superfat
NaOH or KOH for any oil blend, with superfat.
MOST USED
Superfat
Pick one, or read the superfat out of a recipe.
Water discount
All three water conventions, converted live.
Hot process
A wetter cook, and what goes in after it.
Essential oil & fragrance
Usage rate to weight, against your own IFRA limit.
Resize a recipe
Any recipe, restated for the mould you own.
Mold & bar yield
Mold volume to bar count, and back again.
Melt and pour
Base, fragrance and yield. No lye involved.
Cost per bar
Oils, lye, packaging and time, per finished bar.
QUIZ · 5 QUESTIONS
Cold process or hot process — which suits you?
The lye is identical either way, so this is not a chemistry question — it is a question about how you want to spend an afternoon and what you want the bar to look like. Five questions, no sign-up, nothing stored.
QUIZ · 5 QUESTIONS
What soap recipe fits your skin type?
Bar soap is a rinse-off cleanser, and the oil blend decides how gently it cleans. Five questions and you get a starting blend, a superfat and an explanation of what each choice does. Nothing here is medical advice — see a doctor about anything persistent.
Read before your next batch
All guides →guide photo 3:2
How to use a soap calculator
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What is superfat in soap making?
guide photo 3:2
Cold process vs hot process soap
guide photo 3:2
Water discounts explained
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Best lye for soap making
guide photo 3:2
Best soap molds for beginners
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Best oils for cold process soap
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Where to buy lye for soap making
guide photo 3:2
Also making candles? Start at the candle hub
guide photo 3:2
Also making bath bombs? Start at the bath bomb hub
PRINTABLE · 24 PAGES
The Soap Batch Log
Recipe sheet, cure tracker and cost column per batch. Print at home, punch it, keep it by the stick blender.