Rebatch Calculator
Rebatching (hand-milling) rescues ugly or seized soap: grate it down, melt it gently with a little liquid, and remold. This calculator tells you exactly how much liquid to start with — and how far you can go.
How Much Liquid to Add
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Start here (conservative)
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Maximum
Rebatching Step by Step
- Grate the soap finely. A box grater or food processor works — finer shreds melt faster and smoother.
- Add the conservative liquid amount from the calculator above. You can always add more; you can’t take it out.
- Heat gently, lid on. Slow cooker on low or a double boiler, stirring every 15 minutes. Expect 1–2 hours until it looks like thick mashed potatoes.
- Add more liquid only if needed — a splash at a time, up to the maximum above — if dry pockets refuse to melt.
- Glop into molds. Rebatched soap is thick; spoon it in and press down firmly. Rustic texture is normal.
- Cool 24 hours, unmold, and cut.
- Cure 2–4 weeks. The soap is already saponified, but a short cure still firms bars up and improves lather.
Rescue mission: rebatching is how you save seized, separated, or just plain ugly batches — grate, melt, and remold. It also works for blending scraps and ends into “confetti” bars.
