A US fluid ounce is therefore 1/128 of a US gallon while an imperial fluid ounce is 1/160 of an imperial gallon. Further differentiating the US and the imperial gallon, a US gill is divided into four fluid ounces, while an imperial gallon is divided into five. A cup is comprised of two gills, making one gallon equal four quarts, eight pints, sixteen cups, or thirty-two gills. Quarts are then divided into two pints and pints are divided into two cups. In both systems, the gallon is divided into four quarts. In contrast, the imperial gallon, which is used in the United Kingdom, Canada, and some Caribbean nations, is defined as 4.54609 liters. The US gallon is defined as 231 cubic inches (3.785 liters). Gallon (US)ĭefinition: A gallon is a unit of volume specifically regarding liquid capacity in both the US customary and imperial systems of measurement. Although the process of metrication dictated that the pint be replaced by metric units of volume, it is still legal to use the pint as a supplementary unit in the UK, and certain items such as draught beer, cider, and milk in returnable containers are still measured in terms of pints. The difference between the definitions of the US and UK pints arose in 1824 when the UK adopted a new definition of the gallon while the US retained the older English measure of the wine gallon.Ĭurrent use: The dry and liquid pints are still used in the US as a measurement of volume. History/origin: Both the US and UK pints were historically defined as 1/8 of a gallon. In the United States, the liquid pint is approximately 473 mL while the dry pint is 551 mL. The imperial pint is equal to approximately 568 mL. Definition: A pint (symbol: p) is a unit of volume in the imperial and United States customary systems of units.
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