How to Convert Gallons to Liters
A gallon is an imperial unit of volume still widely used in the United States, while the liter is the standard metric unit used in most of the world. One US gallon equals exactly 3.78541 liters. This conversion comes up constantly when following American recipes in a European kitchen, comparing fuel economy between US and European cars, or sizing aquariums and pools listed in gallons. Enter your value above and the result updates instantly — the conversion runs entirely in your browser, with nothing uploaded to any server.
Gallons to Liters Reference Table
For quick reference: 1 gallon is 3.79 liters, 5 gallons is 18.93 liters, 10 gallons is 37.85 liters, and 100 gallons is 378.54 liters. Note that the US gallon and the imperial (UK) gallon are different — one imperial gallon equals 4.546 liters. This tool uses the US gallon by default. If you need the imperial gallon conversion, toggle the option above.
Frequently Asked Questions
What is the difference between a US gallon and an Imperial gallon?
A US gallon is 3.78541 liters, while an Imperial (UK) gallon is larger at 4.54609 liters. The US gallon is used in the United States, while the Imperial gallon is used in the UK, Canada, and some other Commonwealth countries.
Is my data safe?
Yes. This tool runs entirely in your browser using JavaScript. No data is sent to any server. You can verify this by disconnecting from the internet — the converter will still work.