Liters in a gallon

There are 3.785411784 liters in a US gallon (liquid), and 4.54609 liters in an imperial gallon. A liter (L) is a metric measurement of volume. It is not a unit of the International System of Units (SI), but is accepted for use within SI. A gallon is a measurement of volume in the US customary and imperial systems of measurement.

Gallons (and their related units) are primarily used in the United States, the United Kingdom, and their territories. Most other countries use liters for measurements of volume and capacity that the US or UK may use gallons for.

Liters to gallons conversion

The following converter can be used to convert from liters to gallons or gallons to liters. Just enter a value in either liters or gallons to convert between the two. Specify whether you would like the conversion to be done based on imperial or US gallons.


Liters to gallons conversion explained

Converting between liters and gallons requires us to know the relationship between the various definitions of the gallon and a liter.

1 US gallon = 3.785411784 L

1 imperial gallon = 4.54609 L

Knowing these relationships, to convert from a US gallon to a liter, we multiply by 3.785411784; to convert from a liter to a gallon, we divide by the same value. This process is the same for imperial gallons, except that we use 4.54609.


1. Convert 20 liters to US and imperial gallons:

20 L ÷ 3.785411784 ≈ 5.283 US gallons

20 L ÷ 4.54609 ≈ 4.399 imperial gallons

2. Convert 12 US and imperial gallons to liters:

12 US gallons × 3.785411784 ≈ 45.425 L

12 imperial gallons × 4.54609 ≈ 54.553 L