Gallons to Liters Converter
Convert US gallons to litres quickly and accurately. Type a volume in gallons and the equivalent in litres appears instantly.
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Formula
To convert US gallons to litres, multiply the value by 3.785411784.
1 gal = 3.7854 L
litres = US gallons × 3.785411784
About us gallons and litres
The litre is the everyday metric unit of volume, used for fuel, drinks and engine capacity across most of the world.
The US liquid gallon is used for fuel and milk in the United States. It is noticeably smaller than the imperial gallon still referenced in the UK, which is why fuel economy figures do not transfer directly between the two.
Accuracy
This converter uses the US liquid gallon, defined as exactly 3.785411784 litres. The imperial gallon used in the UK and Canada is 4.54609 litres — about 20% larger — so a US "gallon" of fuel is not the same quantity as an imperial one.
US Gallons to Litres conversion table
| US Gallons | Litres |
|---|---|
| 1 gal | 3.7854 L |
| 2 gal | 7.5708 L |
| 3 gal | 11.3562 L |
| 5 gal | 18.9271 L |
| 10 gal | 37.8541 L |
| 15 gal | 56.7812 L |
| 20 gal | 75.7082 L |
| 25 gal | 94.6353 L |
| 50 gal | 189.2706 L |
| 100 gal | 378.5412 L |
Frequently asked questions
How do you convert US gallons to litres?
Litres = US gallons × 3.785411784. For example, 1 gal equals 3.7854 L.
How many litres is 1 US gallon?
One US liquid gallon is exactly 3.785411784 litres, usually rounded to 3.79 L.
How many litres is 5 gallons?
5 US gallons is 18.9271 litres, or about 18.9 L — the size of a large water cooler bottle.
Does this work for imperial gallons?
No. This converter uses the US liquid gallon. For imperial gallons, multiply by 4.54609 instead of 3.7854.
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