Gallons to Liters Converter
Enter a volume in US gallons to see it in liters right away. Edit either box and the other updates live. The math runs in your browser.
How to convert gallons to liters
- Type the volume in US gallons into the left box.
- Read the liters value in the right box as it updates live.
- Edit the liters box instead to convert back to gallons.
Examples
One gallon
1 gal
3.785 L
Car fuel tank
15 gal
56.78 L
Frequently asked questions
How many liters are in a US gallon?
One US gallon is 3.785411784 liters. This converter uses US gallons, which are smaller than imperial gallons.
What is the formula to convert gallons to liters?
Multiply the number of US gallons by 3.785412. For example, 15 gallons is 15 times 3.785412, which is about 56.78 liters.
What is the difference between a US gallon and an imperial gallon?
A US gallon is 3.785 liters, while an imperial (UK) gallon is about 4.546 liters. This tool converts US gallons, so use the imperial figure if your source is UK based.
How do I convert a fuel tank size from gallons to liters?
Multiply the tank's gallon capacity by 3.785412. A 12 gallon tank holds about 45.4 liters, and a 20 gallon tank holds about 75.7 liters.
Is this conversion exact?
Yes. One US gallon is defined as exactly 3.785411784 liters, so the calculation is precise. Results are rounded only for display.
Is my data sent anywhere?
No. The conversion runs entirely in your browser, so the volumes you enter never leave your device.
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