Gallon Gallon The gallon () is a unit of measurement for volume and fluid capacity in both the US customary units and the British imperial systems of measurement. Three significantly different sizes are in current use: the imperial gallon defined as litres (4 imperial quarts or 8 imperial pints), which is used in the United Kingdom, Canada, and some Caribbean nations; the US gallon defined as 231 cubic inches (4 US liquid quarts or 8 US liquid pints) or about , which is used in the US and some Latin American and Caribbean countries; and the least-used US dry gallon defined
Gallon gallon; there are four quarts in a gallon, two pints in a quart, and 20 imperial fluid ounces in an imperial pint. The US gallon is legally defined as 231 cubic inches, which is exactly . A US liquid gallon of water weighs about at , making it about 16.6% lighter than the imperial gallon. There are four quarts in a gallon, two pints in a quart and 16 US fluid ounces in a US pint, which makes the US fluid ounce equal to of a US gallon. In order to overcome the effects of expansion and contraction with temperature