GlenCalc

ABV calculator

Take a hydrometer reading before fermentation (original gravity) and after (final gravity).

Your answer

Alcohol by volume5.25 %
Alternative formula (more accurate above 8%)5.34 %
Apparent attenuation80 %

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How we worked it out

Updated as you change the numbers.

  1. ABV ≈ (OG − FG) × 131.25.

Method and assumptions

Fermentation turns sugar into alcohol and CO₂, lowering the gravity. The simple formula is accurate for typical beers; for strong beers and wines the alternative formula is closer. Correct hydrometer readings for temperature.

Questions

What ABV is OG 1.050 and FG 1.010?

5.25%.

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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