Alcohol-By-Volume (ABV) Calculator

Alcohol By Volume (ABV) Calculator estimates your initial and final gravity readings, and supports both Plato and SG reports for Apparent Attenuation, and Calories. When using a hydrometer, you’re measuring the specific gravity (SG) of your beers density as is relative to water. Because alcohol is less dense than water, by measuring the difference in your beers density before it begins fermentation, and creates the less dense alcohol, you can then measure the alcohol change-by-volume.

Gravity Unit:
Original Gravity:  (
Final Gravity:  (
Alcohol By Volume:
Apparent Attenuation:
per 12oz bottle
Online calculators are designed to be informational and educational tools only. This online calculator is provided as a rough approximation and the results presented by this calculator are hypothetical and may not reflect total accuracy. Hopsteiner is not responsible for the consequences of any decisions or actions taken in reliance, nor responsible for any human or mechanical errors or omissions upon or as a result of the information provided by these tools.