A standard drink is a unit of measurement. In Australia, a standard drink is any drink containing 10 grams of alcohol. One standard drink always contains the same amount of alcohol, independent of the container size (e.g. bottle, can, glass) or alcohol type (e.g. wine, beer, spirit).
The number of standard drinks = 0.789 x the volume of the container (L) x % alcohol by volume (mL/100mL).