Loading…
Loading…
BrewCalc
From gravity readings to alcohol percentage.
ABV ≈ (OG − FG) × 131.25 — this approximation works because the drop in specific gravity directly reflects how much sugar the yeast converted to alcohol and CO₂, and 131.25 is the empirically derived conversion factor.
Apparent attenuation measures what percentage of the original sugars were consumed — most ales finish at 70–80% apparent attenuation, while a very dry beer might hit 85%+ and a sweet stout might be under 65%.
Calculate your new Elo rating after a chess game based on opponent rating and result.
OpenEstimate your golf handicap index from a single round's score, course rating, and slope.
OpenCalculate your bowling average from total pins and games bowled.
OpenCalculate baseball batting average from hits and at-bats.
OpenLast updated: August 2026
ABV
5.25%
What you entered
Gravity drop
1.05 - 1.01= 0.04ABV = gravity drop x 131.25
0.04 x 131.25= 5.25%Apparent attenuation
((1.05 - 1.01) / (1.05 - 1)) x 100= 80%Result
ABV: 5.25%