ABV Calculator

Homebrew-ready: turn your original and final gravity readings into alcohol by volume, plus the alcohol in every bottle.

Original gravity (OG)

Reading before fermentation.

Final gravity (FG)

Reading when fermentation finishes.

Batch volume (liters, optional)

Formula
ABV = (OG − FG) × 131.25

For higher-gravity brews the more precise “alternate” equation is used automatically:
ABV = 76.08 × (OG − FG) ÷ (1.775 − OG)

Apparent attenuation shows how completely the yeast ate the sugars.

🍺 Homebrew ready

Standard and alternate ABV formulas.

🔋 Attenuation

Checks how well the yeast performed.

📦 Batch totals

Pure alcohol in the whole brew.

🎁 Style check

Ballpark where your brew sits.