ABV Calculator
Calculate the alcohol by volume (ABV) of your homebrew using your original gravity (OG) and final gravity (FG) hydrometer readings.
Enter Your Readings
Measured before fermentation. Typical range: 1.030 – 1.120
Measured after fermentation is complete. Typical range: 1.000 – 1.020
Alcohol by Volume (Standard)
5.25%
Formula: (OG − FG) × 131.25
Alternate Formula
5.34%
More accurate for high gravity
Apparent Attenuation
80.0%
Typical: 65-85%
Estimated Calories (per 12 oz)
~88
ABV by Beer Style
Light Lager3.5–4.5%
Blonde Ale4–5.5%
American Pale Ale4.5–6.2%
Hefeweizen4.3–5.6%
English Bitter3.2–4.6%
Irish Stout3.8–5%
American IPA5.5–7.5%
Belgian Dubbel6–7.6%
Imperial Stout8–12%
Barleywine8–14%
Double IPA7.5–10%
Belgian Tripel7.5–9.5%
How It Works
Original Gravity (OG) measures the sugar content of your wort before fermentation. Higher OG means more sugar for yeast to convert.
Final Gravity (FG) measures what's left after fermentation. The difference tells you how much sugar was converted to alcohol.
Attenuation is the percentage of sugars consumed by yeast. Most ale yeasts attenuate 65-80%. Higher attenuation = drier beer.