Liters to Gallons Converter (L to US gal)

The US gallon is defined as 231 cubic inches, exactly 3.785411784 liters. The UK (imperial) gallon is larger, exactly 4.54609 liters, so check which gallon a fuel price, tank size or recipe means before converting.

The liter chart shows both gallons side by side. Fuel tanks, water heaters, aquariums and paint are the usual reasons to convert.

How to use this tool

1. Type a value in the Liter box to see it in US gallons, or type in the US Gallon box to convert the other way.
2. Press ⇄ to swap the two units, or Load example for a typical value.
3. Check the charts below for common values; for other units, open the Volume converter.

Formula

US gal = L ÷ 3.785411784

L = US gal × 3.785411784

Both factors come from exact definitions: 1 us gallon = 3.785411784 liters and 1 liter = 0.264172052358 US gallons (shown to 12 significant digits).

Example

Two conversions worked with the same factors the converter uses:

50 L × 0.264172052358 ≈ 13.2086 gal

15 gal × 3.785411784 ≈ 56.7812 L

Liter to US Gallon chart

Common values from liters to US gallons, rounded to four decimal places.

US Gallon to Liter chart

The reverse direction for values people often look up.

Quick mental estimate

Divide liters by 4 for a rough US-gallon figure: 40 L → 10 gal. A gallon is a little less than 4 liters, so this shortcut comes out about 5% low.

Use the converter or the charts when the exact figure matters.

The two units

Liter (L): The liter is the metric unit of volume accepted for use with the SI. Since 1964 it has been defined as exactly one cubic decimeter, which is 1,000 cubic centimeters.

US Gallon (gal): The US liquid gallon is defined as exactly 231 cubic inches, which is 3.785411784 liters. It is the gallon used for gasoline, milk and water in the United States.