ABV Calculator

What Is ABV?

Alcohol by volume (ABV) measures the percentage of a beverage that is pure ethanol. A beer labeled 5% ABV contains 5 milliliters of alcohol per 100 milliliters of liquid. ABV is the standard measurement for labeling alcoholic beverages worldwide. This calculator estimates ABV from original gravity (OG) and final gravity (FG) readings taken with a hydrometer during the brewing or winemaking process.

How to Calculate ABV

The most common formula is: ABV = (OG – FG) × 131.25. Original gravity is measured before fermentation begins and reflects the sugar content of the liquid. Final gravity is measured after fermentation completes and shows how much sugar the yeast has converted to alcohol. A beer with an OG of 1.050 and FG of 1.010 has an ABV of approximately 5.25%. Higher OG values and lower FG values produce stronger beverages.

Typical ABV Ranges

Light beers: 3–4%. Standard lagers and ales: 4–6%. IPAs and strong ales: 6–9%. Barleywines and imperial stouts: 8–14%. Wine: 11–15%. Fortified wines (port, sherry): 17–22%. Spirits: 35–50%. Knowing the ABV of homemade beverages is important for responsible consumption and for ensuring recipes produce consistent results across batches.

Tips for Accurate Readings

Temperature affects hydrometer readings. Most hydrometers are calibrated for 60°F (15.6°C). If your sample is warmer, the reading will be slightly low. Use a hydrometer temperature correction chart or take readings at the calibration temperature. Ensure the hydrometer floats freely without touching the container walls. Take the reading at the bottom of the meniscus (the curved liquid surface). For the most accurate final gravity, wait until fermentation has completely stopped – consecutive readings 2–3 days apart that show no change confirm fermentation is finished.

Frequently asked questions