Formulae
The number of UK units of alcohol in a drink can be determined by multiplying the volume of the drink (in milliliters) by its percentage ABV, and dividing by 1000.
For example, one imperial pint (568 ml) of beer at 4% ABV contains:
The formula uses ml ÷ 1000. This results in exactly one unit per percentage point per litre, of any alcoholic beverage.
Since 4% can be expressed as .04, .04 × 568 ml gives the amount of alcohol in terms of ml—which, when divided by 10, shows the number of units.
When the volume of an alcoholic drink is shown in centilitres, determining the number of units in a drink is as simple as volume × percentage (converted into a fraction of 1).
Thus, 75 centilitres of wine (the contents of a standard wine bottle) at 12% ABV contain:
Read more about this topic: Unit Of Alcohol
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“I don’t believe in providence and fate, as a technologist I am used to reckoning with the formulae of probability.”
—Max Frisch (1911–1991)