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Units of Alcohol

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A unit of alcohol (as displayed increasingly on beer bottles and cans) is defined as a measure of 10 ml of pure alcohol. To calculate the number of units in a beer, use the following formula.

Volume in millilitres (ml) x % alcohol by volume (ABV)
1000

Example, for a 500 ml bottle of beer of 5%:500 ml x 5% = 2.5 units
 1000 

For bottles and cans measured in fluid ounces (as in the USA), use the following formula.

Volume in fluid ounces (fl oz) x % alcohol by volume (ABV)
33.8

Example, for a 12 fluid ounce bottle of beer of 5%:12 fl oz x 5%= 1.78 units
 33.8 

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