Brewing tool

ABV Calculator

Enter your original and final gravity readings to estimate your homebrew's alcohol by volume. Includes attenuation and a rough calorie estimate.

Original Gravity (OG) Reading before fermentation, e.g. 1.050 Final Gravity (FG) Reading after fermentation, e.g. 1.010

Formula

Standard Advanced

Advanced is more accurate for strong beers (above ~6.5%).

Alcohol by volume 5.25%

4.18%By weight

80%Attenuation

~165Cal / 12 oz

How it works

Alcohol by volume is estimated from the drop in gravity as sugars ferment into alcohol. The standard estimate is (OG − FG) × 131.25. The advanced formula corrects for higher-strength beers where the simple version drifts.

Apparent attenuation – how much of the sugar the yeast consumed – is (OG − FG) / (OG − 1) × 100. The calorie figure is a rough guide per 12 oz (355 ml) serving and varies with residual sugar.

These are estimates for homebrewing reference. For a complete walkthrough, see how to make ale at home and ale fermentation temperature.

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