Liters to Gallons Converter

One US gallon equals exactly 3.785411784 liters (approximately 3.785 L). This is the liquid gallon used for fuel, milk, and most liquids in the United States. There is also a US dry gallon (4.405 L), used for agricultural products like grain. The US gallon is derived from the old English wine gallon and is different from the imperial (UK) gallon, which is larger at 4.54609 liters.

The US gallon (3.785 L) is approximately 17% smaller than the UK imperial gallon (4.546 L). This means: 1 US gallon = 0.833 UK gallons. 1 UK gallon = 1.201 US gallons. This difference matters for fuel economy: a car getting 30 mpg (US miles per US gallon) gets about 36 mpg (UK miles per UK gallon) for the same fuel consumption. When comparing fuel efficiency between American and British cars, always clarify which gallon is being used.

5 US gallons = 18.927 liters (approximately 18.9 L). This is the standard size of a large water cooler jug in the US. 5 UK (imperial) gallons = 22.730 liters. Common 5-gallon references: a standard 5-gallon water cooler bottle, a 5-gallon home brewing fermentation bucket, and a 5-gallon paint bucket (though actual paint buckets hold 5 US gallons of paint).

To convert L/100km to US MPG: MPG = 235.215 ÷ (L/100km). Example: 8 L/100km = 235.215 ÷ 8 = 29.4 MPG (US). To convert US MPG to L/100km: L/100km = 235.215 ÷ MPG. Example: 30 MPG = 235.215 ÷ 30 = 7.84 L/100km. For UK MPG: use 282.48 instead of 235.215 (because the UK gallon is larger).

A half US gallon = 1.8927 liters (approximately 1.9 L). Common half-gallon containers: the standard US milk jug is 1 gallon (3.785 L) or a half-gallon (1.89 L). A standard water pitcher holds about 2 liters (slightly more than a half-gallon). A typical wine bottle is 750 mL = 0.198 US gallons.