Litres to Gallons Converter
Convert volume between litres and US gallons, with UK gallons too. Type in either side.
About this tool
Uses 1 US gallon = 3.785411784 L and 1 UK (imperial) gallon = 4.54609 L, both exact. They differ by about 20%, so check which gallon your source means.
Fuel economy, pool volumes, paint tins and recipes from different countries use different gallons. Type a volume in litres to see US gallons, UK (imperial) gallons and millilitres, or type US gallons to get litres. Both boxes update as you type.
How to use the Litres to Gallons Converter
- Type a volume in litres, for example 10.
- Read the US gallons next to it, and UK gallons below.
- Or type US gallons instead, and the litres update.
- Check whether your source means US or UK gallons; they differ by about 20%.
A 50-litre fuel tank
50 L ÷ 3.785411784 = 13.209 US gallons, or 50 ÷ 4.54609 = 10.998 UK gallons. Going the other way, a 5-gallon US water bottle holds 18.927 litres.
US and UK gallons
There are two gallons in common use. The US gallon is exactly 3.785411784 litres; the UK or imperial gallon, still used for fuel economy in the UK, is exactly 4.54609 litres. A UK gallon is about 1.2 US gallons, so always check which one a recipe, fuel figure or product label uses.
Frequently asked questions
How many litres is 1 US gallon?
Exactly 3.785411784 litres, usually rounded to 3.785.
How many litres is 1 UK gallon?
Exactly 4.54609 litres.
How many US gallons is 20 litres?
About 5.283 US gallons.
Which gallon does a car fuel figure use?
US figures (miles per gallon) use US gallons; UK mpg figures, still widely quoted today, use imperial gallons.