Free suite of 40 calculators for home distillers and fermenters: ABV and dilution, still cuts planning, hydrometer and alcoholmeter temperature correction, yeast pitch rates, nutrient dosing (TOSNA), priming sugar, mash infusion steps, and pot/column still simulators built on vapor-liquid equilibrium data. Every formula audited against primary sources (NIST, OIML, ICUMSA), documented on the methodology page. No signup, no paywall, installable, works offline.
Simple and lightweight
DistilCalc appears to be a streamlined, minimalistic calculator tool that focuses on core calculation functionality without unnecessary bloat, making it fast to load and easy to use.
Accessible online
As a web-based tool, it can be accessed from any device with a browser without needing to install software, making it convenient for quick calculations.
No cost barrier
Being a free online tool removes financial barriers, allowing anyone to use it for basic calculation needs without a subscription or purchase.
Focused functionality
By specializing in calculation tasks, the tool likely provides a clean, distraction-free interface tailored to users who need quick numeric results.
Easy to share
As a web link, results or the tool itself can be easily shared with others via URL, useful for collaborative work or quick reference.
Home distillers, mead makers, cider makers, winemakers, and homebrewers, from first-batch beginners using the presets to experienced hobbyists who care about hitting exact numbers. Craft distillery staff also use the planning tools. Anyone whose hobby involves a hydrometer.
Every formula on the site was audited line by line against primary sources: NIST Circular 19 for alcoholmeter temperature correction, the OIML R 22 alcoholometric tables for dilution, ICUMSA polynomials for sugar conversions, published vapor-liquid equilibrium data for the still simulators, and manufacturer specifications for yeast dosing. The audit found errors in commonly circulated hobby formulas (most temperature correction tables online run in the wrong direction) and the full audit is documented publicly on the methodology page. As far as I know, no other calculator suite in this niche publishes its verification.
Three reasons. Accuracy: the formulas are verified against the standards professional distilleries use, not copied from forum posts. Coverage: 40 calculators span the entire workflow, from planning a wash and pitching yeast through fermentation, distillation cuts planning, dilution to bottling strength, and pot/column still simulation, so nothing forces you to jump between five sites. Friction: no signup, no paywall, no feature gating, installable as an app, and it works offline.
I'm a chemistry student in Belgium and a fermentation hobbyist. The site started because I kept catching wrong numbers in the hobby's calculators, and the breaking point was discovering that the alcoholmeter temperature correction tables circulating on most distilling sites correct in the wrong direction, and mine had absorbed the same bad data. So I audited all 40 calculators against primary sources, fixed what was wrong, published the audit, and made everything free.
Static HTML/CSS/vanilla JavaScript served through a Cloudflare Workers edge handler, with a service worker for offline use and PWA installation. No frameworks, no build step, no backend database. Pages load in well under a second worldwide.
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