ABV & Attenuation Calculator

Calculate alcohol content, attenuation, and calories for your homebrew

1) Enter Your Beer Data

Original Gravity (OG)

Final Gravity (FG)

Batch Size (Optional)

Units

Use high-accuracy ABV formula for strong beers (>7% ABV)

Beer Style Presets

Tip: For most accurate results, take gravity readings at the same temperature and calibrate your hydrometer.

2) Calculation Results

Beer Style
Select a preset to see style characteristics

ABV

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Alcohol by Volume

Apparent Attenuation

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% Sugars Consumed

Real Attenuation

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% Actual Fermentation

Calories per 12oz

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Total Calories

Total Alcohol

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Total Calories

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ABW

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Using standard ABV formula: (OG – FG) × 131.25

Please check your gravity readings – FG should be lower than OG.

Definitions:
• ABV: Alcohol by Volume – percentage of beer that is alcohol
• Apparent Attenuation: Measured sugar consumption (what your hydrometer reads)
• Real Attenuation: Actual sugar consumption (accounts for alcohol’s lower density)
• ABW: Alcohol by Weight – alcohol percentage by weight, not volume