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Alcohol proof is a measure of the content of ethanol (alcohol) in an alcoholic beverage. The term was originally used in the United Kingdom and was equal to about 1.75 times the alcohol by volume (ABV). The UK now uses the ABV standard instead of alcohol proof. In the United States, alcohol proof is defined as twice the percentage of ABV.
Liquor Alcohol Content. The alcohol content of distilled beverages (spirits and liqueurs) is much easier to find than in fermented beverages like beer or wine because it must be specified on the container. It is generally depicted in percent alcohol by volume (ABV), in percentage by weight (sometimes abbreviated w/w for weight for weight), or in proof.