Convert Liter to Gallon (US)

The liter was originally introduced in France in the 18th century as part of the metric system during the French Revolution. It was based on the volume of 1 kilogram of water at the temperature of its maximum density, which is about 4°C. Over time, the liter became a standard unit for measuring liquids and volumes in many countries around the world. Although the liter is not an SI base unit (the SI unit of volume is the cubic meter), it is accepted for use with the SI, and it remains widely used internationally for measuring everyday volumes, such as beverages, fuel, and cooking ingredients.

The US gallon originated from the British gallon, which itself was derived from earlier definitions of the gallon in medieval England. The British gallon was based on the volume of eight pounds of water, but the US gallon, which was standardized in 1824, was redefined to be 231 cubic inches in volume. This definition was adopted to better align with the measurements used in the U.S. liquid measurement system. The US gallon is slightly smaller than the imperial gallon (used in the UK and other Commonwealth countries), which is defined as 4.54609 liters. Despite the global shift to the metric system, the US gallon remains widely used in the United States for measuring liquid volumes.