

What is a unit of alcohol?A unit of alcohol is 10 ml of pure alcohol. This measurement is used in Britain to produce guidelines on how much it is healthy for adults to drink, in a day and over a week, and to measure what would constitute heavy drinking, binge drinking, etc. A unit is roughly the amount that an adult can digest in an hour. Units of alcohol in a drink are calculated by multiplying the alcohol by volume (or ABV, normally shown as a percentage on the label) by the number of millilitres, divided by 1000, such that a half litre (500ml) can of beer at 4.5% ABV would be (4.5 x 500) / 1000 = 2.25 units. Units of alcohol have different definitions around the world, but this site uses this measurement in its diary calculations. Further Information: Please note: Adverts provided by third parties on this page might use cookies, but this site does not. If you do not consent to this please navigate away from this page. 
