Fermentation ABV Calculator
ABV ≈ (OG − FG) × 131.25 · Quick brewers' formula in % alcohol by volume.
- ABV (simple)
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- Apparent attenuation
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- Calories / 12 oz (rough)
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Simple formula good to ~6% ABV. Above that, prefer the alternative formula in the dedicated specific-gravity tool.
About this tool
Fermentation ABV Calculator is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
Category: Food & Beverage — Advanced. Browse more Food & Beverage — Advanced tools.