DistilCalc
40 free distilling calculators, audited against NIST
DistilCalc launched on August 18, 2026 with 1 votes, #11,494 of 23,274 launches that month.
What it does
DistilCalc is a free suite of 40 calculators and 41 guides for home distillers, mead makers, and fermenters. Dilution, cuts planning, temperature correction, yeast pitch rates, nutrient dosing, priming, mash steps, and three still simulators built on real vapor-liquid equilibrium data. No signup, no paywall, works offline. In August 2026 every formula was audited against primary sources (NIST Circular 19, OIML R 22, ICUMSA, the TOSNA protocol) and the audit is public on the methodology page.
Free distilling calculators for dilution, cuts, gravity, nutrients and priming. Every formula computed from OIML, NBS and TTB primary sources, and shown.
Every formula on this site is computed from a named primary source, and every page tells you which one. Here is one, working, right now. How a pot still run divides, to scale. Foreshots are sized from the charge, not from what you collect: 2.5 mL per litre, 25 mL minimum. Size yours → OIML R 22 for alcoholometry, NBS Circular 19 for temperature correction, TTB 27 CFR 30.11 for proof. Not a forum post that cited a forum post. Each page states its formula and where it stops being accurate. A calculator that hides its assumptions is asking to be trusted blindly. The site, the offline app and the printed guide are generated from the same formula library, so two DistilCalc tools never…from distilcalc.com
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