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The gallon is a measure of volume approximately equal to four liters. Historically it has had many different definitions, but there are three definitions in current use. In United States customary units there are the liquid (≈ 3.79 L) and the lesser used dry (≈ 4.4 L) gallons. There is also the imperial gallon (≈ 4.55 L) which is in unofficial use within the United Kingdom and Ireland and is in semi-official use within Canada.[1] The gallon, be it the imperial or US gallon, is sometimes found in other English-speaking countries.



  • The imperial (UK) gallon was legally defined as 4.5460L. This definition is used in some Commonwealth countries and Ireland, and is based on the volume of 10 pounds of water at 62 °F. (A US liquid gallon of water weighs about 8.33 pounds at the same temperature.) The imperial fluid ounce is defined as 1160 of an imperial gallon. On 1 January 2000, it ceased to be a legal unit of measure within the United Kingdom for economic, health, safety or administrative purposes.[2]
  • The US liquid gallon is legally defined as 231 cubic inches,[3] and is equal to exactly 3.785411784 litres or about 0.133680555 cubic feet. This is the most common definition of a gallon in the United States. The US fluid ounce is defined as 1128 of a US gallon.
  • The US dry gallon is one-eighth of a US Winchester bushel of 2150.42 cubic inches, thus it is equal to exactly 268.8025 cubic inches or 4.4048837708L. The US dry gallon is less commonly used, and is not listed in the relevant statute, which jumps from the dry quart to the peck.[3]

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