A US gallon is exactly 3.785411784 liters. Watch out for the imperial gallon used in the UK, which is about 4.546 liters - roughly 20% larger. That difference matters when comparing fuel economy or following a recipe from another country.
Calculator
Formula used
liters = US gallons × 3.785411784 · US gallons = liters ÷ 3.785411784
How to use the Gallons to Liters Converter
- Enter a volume in US gallons.
- Read the equivalent in liters.
- Or enter liters to convert back to gallons.
- Use the table for common volumes such as 1, 5 or 20 gallons.
About this tool
The Gallons to Liters Converter is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Converting fuel tank capacity.
- Scaling a recipe between US and metric measures.
- Checking aquarium or pool volume.
- Comparing beverage container sizes.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
Is a UK gallon the same?
No. An imperial gallon is 4.54609 liters, while the US gallon used here is 3.78541 liters.
How many liters is a half gallon?
About 1.89 liters, since a US gallon is 3.785 liters.
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