Alcohol by Volume
ABV Calculator
Turn your gravity readings into an accurate final ABV in seconds.
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Alcohol by Volume5.38%
The Formula
ABV = (OG − FG) × 131.25. A slightly more accurate alternate formula is used for stronger beers, but this classic version is reliable for most homebrew.
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Beginner Tips
- •Take gravity readings at the same temperature, or use temperature correction.
- •Always sanitize your hydrometer or refractometer sample.
- •Record OG before pitching yeast and FG only once gravity is stable for 3 days.
Common Mistakes
- •Reading FG too early and assuming fermentation is done.
- •Forgetting to account for refractometer alcohol distortion.
- •Not calibrating your hydrometer in distilled water.