Brewing tool
ABV Calculator
Use your original and final gravity readings to get a quick ABV estimate.
Guide
Before you start
Take the original gravity before fermentation and the final gravity once fermentation is done. The drop between the two gives you the ABV estimate.
Calculator
Enter your values
Method
How this is estimated
ABV is estimated from the drop between original gravity and final gravity. This quick formula is a good brew day check for most beers.
ABV ≈ (OG - FG) × 131.25
Safety and limits
A few notes
This is only as good as the readings you put in. If you used a refractometer after fermentation, correct that reading first.
Use accurate measurements for the best estimate.