How to Convert Liters to Gallons: A Complete Guide

Whether you are calculating fuel efficiency for a road trip, buying paint for a renovation, or following a brewing recipe, knowing how to convert liters to gallons is an essential skill. However, this conversion has a hidden trap that catches many people off guard: the US gallon and the UK (Imperial) gallon are not the same size!

The US Gallon vs. The UK Gallon

Before you calculate anything, you must know which gallon you are converting to.

• The US Liquid Gallon: Used primarily in the United States. One US gallon is exactly equal to 3.78541 liters.
• The UK Imperial Gallon: Used in the United Kingdom, Canada, and some Caribbean nations. One Imperial gallon is exactly equal to 4.54609 liters.

As you can see, the UK gallon is about 20% larger than the US gallon. If you use the wrong formula, your measurements will be significantly off.

The Conversion Formulas

If you want to do the math manually, here are the formulas you need.

Liters to US Gallons

To convert liters to US gallons, divide the number of liters by 3.785. For example, if you have 50 liters of fuel, you divide 50 by 3.785, which equals approximately 13.2 US gallons.

Liters to UK Gallons

To convert liters to UK Imperial gallons, divide the number of liters by 4.546. Using the same 50 liters, dividing by 4.546 gives you approximately 11.0 UK gallons.

Quick Reference Chart (Liters to US Gallons)

For quick everyday use, here is a reference chart for converting liters to the standard US gallon: