alcohol proof calculator
Calculate alcohol by volume (ABV) for homemade beverages, cocktails, and brewing.
Specific gravity before fermentation
Specific gravity after fermentation
Results
Alcohol by Volume (ABV):
0.0%
Alcohol by Weight (ABW):
0.0%
Attenuation:
0.0%
How to Use This Calculator
This calculator uses the standard formula for calculating alcohol by volume (ABV) in fermented beverages:
ABV = (OG - FG) × 131.25
Steps:
- Measure the specific gravity before fermentation (Original Gravity)
- Measure the specific gravity after fermentation (Final Gravity)
- Enter both values in the calculator
- Click "Calculate ABV" to get your results
What You'll Get:
- ABV: Alcohol by Volume percentage
- ABW: Alcohol by Weight percentage
- Attenuation: Percentage of sugars converted to alcohol
Pro Tips
- • Use a hydrometer for accurate gravity readings
- • Take readings at the same temperature (usually 68°F/20°C)
- • For wine, typical OG ranges from 1.080-1.100
- • For beer, typical OG ranges from 1.040-1.060
- • Higher attenuation means more sugars were converted to alcohol