To find the alcohol content of your homemade beer or wine, measure the specific gravity before fermentation begins (original gravity, OG) and after fermentation is complete (final gravity, FG). A hydrometer or refractometer gives you these numbers. Enter them above, and the alcohol by volume calculator instantly estimates the ABV.
The calculation uses the formula (OG – FG) × 131.25, a widely accepted approximation for typical beer and wine fermentations. For example, an OG of 1.050 and FG of 1.010 yields about 5.25% ABV. This homebrew ABV calculator works for most styles, including high-gravity beers and country wines, but keep in mind that very high alcohol or unusual sugar sources may introduce small variances.
Use this alcohol by volume calculator to track fermentation progress, adjust recipes, or simply satisfy your curiosity. Reliable gravity readings at the right temperatures (calibrated to 60 °F / 15.6 °C) give the most accurate result. Whether you are brewing your first batch or your fiftieth, this tool helps you understand the strength of your creation.