Homebrew ABV Calculator from Gravity Readings
Enter your original and final gravity to calculate the alcohol percentage.
Alcohol by volume (ABV)–
Apparent attenuation–
ABV ≈ (OG − FG) × 131.25. Take gravity readings at the same temperature and correct if needed. Attenuation shows how much sugar the yeast converted.
⚠️ Please drink responsibly. Homebrewing laws vary by country — check your local rules.
Estimates only — actual ABV can vary slightly depending on hydrometer accuracy and technique.