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The US fluid ounce is based on the US gallon, which in turn is based on the wine gallon of 231 cubic inches that was used in the United Kingdom prior to 1824. With the adoption of the international inch, the US fluid ounce became 1⁄128 gal × 231 in 3 /gal × (2.54 cm/in) 3 = 29.5735295625 mL exactly, or about 4% larger than the imperial unit.
For comparison, both measurements are shown here, as well as the number of standard drinks contained in 500 millilitres (16.9 US fluid ounces) of 5% ABV beer (a typical large size of beer in Europe, slightly larger than a US pint of 473 mL). The terminology for the unit also varies, as shown in the Notes column.
An imperial fluid ounce is defined in British law as 28.4130625 millilitres, [15] a US customary fluid ounce is 29.57353 mL, [16] and a US food labelling fluid ounce is 30 mL. [17] The fluid ounce is sometimes referred to simply as an "ounce" in contexts where its use is implicit, such as bartending .
Consequently, a fluid ounce of water weighs about 1.041 ounces avoirdupois. For nutritional labeling and medicine in the US, the teaspoon and tablespoon are defined as a metric teaspoon and tablespoon—precisely 5 mL and 15 mL respectively. [21] The saying, "a pint's a pound the world around", refers to 16 US fluid ounces of water weighing ...
This made a Wine Gallon "Reputed Pint" equivalent to 2 ⁄ 3 US liquid pint (10.66 US fluid oz.), 11.09 imp. oz, or 315 mL. Although the Imperial system was introduced in 1824, bottles of ale or beer were still sold in Reputed Pints (13.3 imperial oz) but were now based on the Imperial gallon (based on the British Ale Gallon).
In Canada, a teaspoon is historically 1⁄6 imperial fluid ounce (4.74 mL) and a tablespoon is 1⁄2 imperial fl oz (14.21 mL). In both Britain and Canada, cooking utensils come in 5 mL for teaspoons and 15 mL for tablespoons, hence why it is labelled as that on the chart. The volumetric measures here are for comparison only.
English-speaking countries also used a system of units of fluid measure, or in modern terminology volume units, based on the apothecaries' system. Originally, the terms and symbols used to describe the volume measurements of liquids were the same as or similar to those used to describe weight measurements of solids [33] (for example, the pound by weight and the fluid pint were both referred to ...
30 to 44 ml (1.0 to 1.5 US fl oz) 59 to 89 ml (2 to 3 US fl oz) There is no official size for a single shot, except in Utah, where a shot is defined as 1.5 US fl oz (44.4 ml). [25] Elsewhere in the U.S., the standard size is generally considered to be 1.25–1.5 US fl oz (37–44 ml).