By Zencalcy Editorial TeamLast reviewed About us
ABV = (OG - FG) * 131.25 (approx). Enter original gravity and final gravity to get the alcohol by volume percentage of your brew.
Alcohol by volume from gravity and OG/FG.
ABV = (OG - FG) * 131.25
| Symbol | Meaning |
|---|---|
| OG | Original gravity, e.g. 1.050 |
| FG | Final gravity, e.g. 1.010 |
OG 1.050, FG 1.010 -> (1.050 - 1.010) * 131.25 ≈ 5.25% ABV.
Continue with the Alcohol Dilution Calculator, Chilled Drink Calculator, or the SO2 Wine Calculator — or browse more brewing & drinks tools and all cooking calculators.
Close enough for most homebrew. The full formula gives slightly different results at extreme gravities.
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Content updated: September 2026