A unit is 8 grams of pure alcohol. The amount of alcohol in any given type of drink will depend on how big the glass, bottle or can is, and how strong the drink is. As a rule of thumb: 1 unit is half a pint (284ml) of ordinary strength lagerbeercider (3.5% ABV); or a single 25ml pub measure of spirit (40% ABV); or a small glass of wine (9% ABV). The formula is to multiply the amount of liquid (volume), measured in millilitres, by the alcoholic strength, measured in percentage of alcohol by volume (ABV). Then divide the total by 1000 to get the number of units.
Daily guidelines for sensible drinking: females 2-3 units or less; males 3-4 units or less. Refraining on one day should not mean excess on another.
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