Alcohol Gravity to Potential Percent, ABV, and Efficiency Calculator

This calculator can help run a few numbers to make homebrew labels more precise.

Brewing Calculator

Wort Volume (gallons): OG (e.g. 1.080): Potential % (e.g. 10.5):

Leave this blank to have it calculated from OG (or vice versa)

Total PPG (e.g. 36):

This is the summation of each grain's PPG * lbs. Do not mix one grain's ppg with another grain's lbs!

FG (e.g. 1.015): Final % (e.g. 2):

Leave this blank to have it calculated from FG (or vice versa)

Efficiency rates how close you got to extracting all theoretical sugars from the grain while mashing.
A typical mash efficiency is 85%, but can be less in a home setting. 60-80% is fine.

This calculator also converts Gravity to Potential Percent if you leave one option blank.
ABV = (OG-FG) * 131
Potential percent = (OG-1) * 131