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.