Gallons to Liters Converter

1 US gallon = 3.78541 liters. Quick estimate: multiply gallons by 3.8. For example, 5 gallons = 18.93 liters. Note: 1 UK (Imperial) gallon = 4.54609 liters (larger than US gallon).

The US gallon (128 fl oz / 3.785 L) was based on the English wine gallon, while the UK Imperial gallon (160 fl oz / 4.546 L) was standardized later as the volume of 10 pounds of water. The US kept the older, smaller gallon.

Convert both to the same units. If US gas is $3.50/gallon: $3.50 ÷ 3.785 = $0.92/liter. Compare that to European prices (often €1.50-2.00/liter). Don't forget currency conversion too.