serving sizes
of alcoholic beverages

Australia

See drink.

Austria

See Trinkeinheit.

Japan

go, 19.76 grams of ethanol

United Kingdom

Regulations promulgated under the Weights and Measures Act of 1985 require:

Draft beer and cider may only be sold in quantities of 1/3 pint, ½ pint, or multiples of ½ pint. A stamped glass or, alternatively, a stamped measuring instrument must be used.
Gin, rum, vodka and whiskey may only be sold in quantities of 25 milliliters or 35 mL, or multiples thereof. A notice must be displayed on the premises stating on what amount the drinks are based. A stamped "thimble" (shot glass to Americans) must be used to measure the drink, or alternatively, stamped measuring instruments. These requirements don't apply if a customer asks for a different amount as part of a mixture of liquids. or if the drink contains 3 or more liquids, whether or not the customer requests it.
Other spirits need not be sold by defined quantities. If, however, the premise's menu or signage indicates a quantity, the drink must be measured, in SI units, with stamped measures or instruments.
Wine sold by the glass may only be sold in quantities of 125 mL or 175 mL. Stamped glasses may be used, a stamped measure, or stamped apparatus. A sign must be displayed saying on which quantity the servings are based.
Wine sold in carafes may only be sold in quantities of 250 mL, 500 mL, 750 mL or 1 liter. The requirement does not apply to wine pre-packed in a sealed container (for example, a bottle of wine). Equipment or measures used to determine the quantity must be stamped.

Stamped glasses are a feature of British pub life. The stamp is a picture of a crown, with a measure (such as "pint") above it and a number below. A stamped brim glass is meant to be filled to the brim. A stamped lined glass has a line; the glass is filled to the line. Stamped wine glasses are always of the lined type.

United States

A standard publication of the U. S. Dept of Agriculture/U.S. Dept. of Health and Human Services states:

"Count as a drink:

12 ounces of regular beer (150 calories)
5 ounces of wine (100 calories)
1.5 ounces of 80-proof distilled spirits (100 calories)"

U. S. Dept of Agriculture/U.S. Dept. of Health and Human Services.
Nutrition and Your Health: Dietary Guidelines for Americans. 4th edition.
Washington, DC: USGPO, 1995.

Repeated in the fifth edition (2000).