ABV
5.25%
ABV Calculator
This calculator estimates alcohol by volume from original gravity (OG) and final gravity (FG). It supports SG, Brix, and Plato inputs plus optional hydrometer temperature correction and batch-size alcohol volume.
ABV from Gravity Readings
ABW
4.16%
Apparent attenuation
80.0%
1.05 L pure alcohol
OG/FG in SG: 1.050 / 1.010
How these formulas work
Standard ABV: ABV = (OG - FG) × 131.25. This widely used linear equation is quick and accurate for most beer-strength fermentation ranges.
Advanced ABV: (76.08 × (OG - FG) / (1.775 - OG)) × (FG / 0.794). This version adjusts for density changes at higher gravities.
Hydrometer correction: the calculator applies the ASBC-style polynomial correction factor (same family used in major brewing calculators) based on sample and calibration temperatures.
More alcohol tools
FAQ
What is a normal FG for beer?
Many ales finish around 1.008–1.016 SG, but yeast strain, mash profile, and fermentation temperature can push it outside that range.
Should I use corrected OG and FG for ABV?
Yes. Correcting both gravity readings to your hydrometer's calibration temperature gives a cleaner ABV estimate than correcting only one side.
Is this medical or legal advice?
No. These are educational brewing calculations only and should not be used to make health, workplace, or legal decisions.