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ABV Formula

Alcohol by volume (abbreviated as ABVabv, or alc/vol) is a standard measure of how much alcohol (ethanol) is contained in an alcoholic beverage.

During the production of wine and beer, yeast is added to a sugary solution. During fermentation, the yeast organisms consume the sugars and produce alcohol. The density of sugar in water is greater than the density of alcohol in water. A hydrometer is used to measure the change in specific gravity (SG) of the solution before and after fermentation. The volume of alcohol in the solution can then be calculated.

To find the alcohol of your beer, you will need both your OG (original) and TG (target).  Simply plug those numbers in the following formula:

ABV = (1.05/0.79) x ((OG – TG) / TG) x 100

Where 1.05 is the number of grams of ethanol produced for every gram of CO2 produced, and .79 is the density of ethanol.

Typical amounts of alcohol contained in various beverages.

DrinkTypical ABV
Fruit Juice (naturally occurring) less than 0.1%
Low-Alcohol Beer 0.05% – 1.2%
Cider2% – 8.5%
Beer2% – 12%
Malt Liquor 5% +
Barley Wine (strong ale) 8% – 15%
Mead8% – 16%
Wine9% – 16%
Dessert Wine 14% – 25%
Sake (rice wine) 15%
Liqueurs15% – 55%
Tequila32% – 60%
Vodka35% – 50%
Brandy35% – 60%
Rum37.5% – 80%
Gin40% – 50%
Whisky40% – 61%