How many litres in a gallon?

A comprehensive guide to understanding the difference between UK and US gallons.

UK Imperial Gallon

4.546

Litres

US Liquid Gallon

3.785

Litres

The Conversion Ratio: Litres to Gallons

When it comes to converting litres to gallons, it's important to understand the conversion ratio between these two units of measurement. This knowledge can come in handy in various situations, such as when you're travelling abroad or working with different measurement systems.

Litres UK Gallons US Gallons
1 0.22 0.26
5 1.10 1.32
10 2.20 2.64
20 4.40 5.28
50 11.00 13.21

As you can see from the table above, the number of gallons is always smaller than the corresponding number of litres due to the difference in their sizes.

Why the difference?

The Imperial gallon is primarily used in the United Kingdom and other Commonwealth countries. It is defined as 4.54609 litres. On the other side of the pond, we have the US gallon, which is commonly used in the United States. The US gallon is slightly smaller than its imperial counterpart, measuring around 3.78541 litres.