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 the sale of gasoline. All other products are sold in litres and its multiples and submultiples. Antigua and Barbuda planned to switch over to using litres by 2015, but the switch-over had not been effected. In the Turks & Caicos Islands, both the U.S. gallon and Imperial gallon are used, due to an increase in tax duties disguised by levying the same duty on the 3.79 L U.S. gallon as was previously levied on the 4.55 L Imperial gallon. Both the US liquid and imperial gallon are divided into four quarts ("quart"er gallons), which in turn are divided into two