Brewing Tools
ABV Calculator
Enter your original gravity and final gravity to calculate alcohol by volume and apparent attenuation.
01
Gravity Readings
Enter Your Numbers
Your Results
—.—
% ABV
Apparent Attenuation
— %
Gravity Points Consumed
— points
Enter your gravity readings and select Calculate ABV.
The Math
How ABV Is Calculated
ABV = (OG − FG) × 131.25
This common homebrewing formula estimates alcohol by volume from the change in specific gravity during fermentation.