Hi Product Hunt! I'm Cameron, a chemistry student from Belgium and a home fermentation hobbyist. DistilCalc started because I kept catching wrong numbers in the hobby's calculators. The breaking point: I discovered that the alcoholmeter temperature correction tables circulating on most distilling sites are wrong in direction (they correct warm readings up instead of down) and off by about half in magnitude. Mine had absorbed the same bad data. So I audited all 40 calculators line by line against primary sources: NIST's alcoholometer tables, published vapor-liquid equilibrium data, the ICUMSA sugar polynomials, manufacturer yeast specs. Four formulas needed fixing, and the whole audit is documented publicly on the methodology page. The suite covers the full workflow: planning a wash, pitching and feeding yeast, tracking fermentation, planning a distillation run with cuts, diluting to bottling strength, and simulating pot and column stills. Free, no signup, works offline. Happy to answer anything about the chemistry, the audit, or the weirder corners of fermentation math.

DistilCalc

40 free distilling calculators, audited against NIST

40 free distilling calculators, audited against NIST