Beer ABV Calculator
Enter original gravity and final gravity on the same scale to estimate beer ABV.
A QUICK WALKTHROUGH
How to use this tool
- Enter the original gravity (OG) reading.
- Enter the final gravity (FG) reading from the same specific-gravity scale.
- Calculate and review the approximate alcohol by volume.
Approximation
ABV ≈ 131.25 × (OG − FG). OG and FG must use the same specific-gravity scale. Reference: https://www.open.edu/openlearn/mod/oucontent/view.php?id=97195§ion=_unit9.1.3
Limits
Temperature and hydrometer corrections affect the estimate. This is not a laboratory or legal alcohol test.
GOOD TO KNOW
Common questions
What formula is used?
Approximate ABV is 131.25 times the difference between OG and FG.
Can I use different gravity scales?
No. OG and FG must use the same scale.