A 'standard drink' is the measure of alcohol used to work out safe drinking levels.
A standard drink in Australia contains 10g of alcohol. A serving of alcohol in a pub or club can often be larger than a 'standard' drink, for example a standard glass of wine is 100ml but a typical serve may be 150ml.
In Australia, all bottles, cans and casks containing alcoholic beverages are required by law to state on the label the approximate number of standard drinks they contain.
Easy-to-read resource, available in all NSW public libraries.