Home Brew Alcohol Calculator
Estimate the alcohol content of your homemade beer, wine, or cider by entering the original gravity (OG) and final gravity (FG) readings from your hydrometer.
Estimated ABV
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Original gravity—
Final gravity—
Estimated ABV (%)—
About this calculator
Calculate the alcohol by volume (ABV) of your homebrew beer, wine, or cider using original and final gravity readings.
Frequently Asked Questions
What is original and final gravity?
Original gravity (OG) is the density of your liquid before fermentation, and final gravity (FG) is the density after fermentation. The difference reflects how much sugar was converted to alcohol.
How accurate is this ABV formula?
This uses the standard simplified formula (OG-FG)*131.25, which is accurate for most home brewing purposes, though more complex formulas exist for higher-gravity brews.