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A standard drink is a measure of alcohol consumption representing a hypothetical beverage which contains a fixed amount of pure alcohol. A standard drink varies in volume depending on the alcohol concentration of the beverage , but it always contains the same amount of alcohol and therefore produces the same amount of drunkenness.
The standard drink is used in relation to recommendations about alcohol consumption and its relative risks to health. Many government health guidelines specify low to high risk amounts in units of grams of pure alcohol per day, week, or single occasion. The concept of the standard drink is meant to help visualize and estimate the absolute alcohol content of various drink concentrations and serving sizes.
Labeling is usually required to give an indication of alcoholic content of a serving.