Liters to Gallons Calculator

The liter is the standard unit of liquid volume across most of the world, while the US gallon dominates everyday measurements in the United States — from fuel economy labels to paint cans to swimming pool capacity. Converting between the two is a practical need for travelers checking gas prices abroad, importers comparing container sizes, home brewers scaling international recipes, and anyone purchasing liquids from a metric market. The US gallon is defined as exactly 3.785411784 liters, making the conversion between the two units precise. One liter is approximately 0.264 gallons, and 10 liters is about 2.64 gallons — useful benchmarks for quick mental math. Note that the UK imperial gallon is larger at 4.546 liters and gives a different result. This calculator always uses the US liquid gallon.

The US liquid gallon is defined as exactly 3.785411784 liters. To convert liters to US gallons, the calculator divides by this value — or equivalently, multiplies by the reciprocal 0.264172. So for any volume V in liters: gallons = V × 0.264172. The conversion factor comes from the relationship 1 US gallon = 231 cubic inches, combined with the SI definition of 1 inch = 2.54 cm exactly. The UK imperial gallon is a different unit equal to 4.54609 liters, giving a smaller gallon-per-liter factor of approximately 0.2200. This calculator uses the US gallon only. Results are returned to four decimal places for precision.