Volume conversion
US gallons to Litres (gal to L)
1 gal = 3.7854 L — multiply the number of US gallons by 3.7854.
US gallons to Litres conversion chart
| US gallons | litres |
|---|---|
| 1 gal | 3.7854 L |
| 2 gal | 7.5708 L |
| 3 gal | 11.3562 L |
| 4 gal | 15.1416 L |
| 5 gal | 18.9271 L |
| 6 gal | 22.7125 L |
| 7 gal | 26.4979 L |
| 8 gal | 30.2833 L |
| 9 gal | 34.0687 L |
| 10 gal | 37.8541 L |
| 12 gal | 45.4249 L |
| 15 gal | 56.7812 L |
| 18 gal | 68.1374 L |
| 20 gal | 75.7082 L |
| 25 gal | 94.6353 L |
| 30 gal | 113.562 L |
| 40 gal | 151.416 L |
| 50 gal | 189.271 L |
| 60 gal | 227.125 L |
| 75 gal | 283.906 L |
| 100 gal | 378.541 L |
How to convert by hand
1 gal (US) = 3.78541178 L
Because this is a linear conversion, the ratio never changes: every US gallon is always 3.7854 L, whatever the size of the number.
Worked example: 10 gal × 3.7854 = 37.8541 L .
Related conversions
About US gallons and litres
Volume conversions trip people up because US and imperial measures share names but differ in size — a US gallon is roughly 20% smaller than an imperial one.
US gallon
US customary231 cubic inches, or about 3.785 litres. Smaller than the imperial gallon.
Commonly used for: Fuel and milk in the United States.
Litre
MetricOne cubic decimetre, or 1,000 millilitres.
Commonly used for: Fuel, drinks and engine capacity outside the US.
Questions
How many litres are in one US gallon?
One US gallon equals 3.7854 L. To convert any amount, multiply the number of US gallons by 3.7854.
What is 5 gal in L?
5 gal = 18.9271 L. Type any value into the converter above to get an exact answer.
How do I convert litres back to US gallons?
Divide by 3.7854 instead of multiplying — or use our Litres to US gallons converter.
Is this converter accurate?
Yes. Linear conversions use the internationally agreed factors published by NIST (SP 811), and temperature conversions use the exact defining formulas. Calculations run at full double precision and are only rounded for display.
Need a different unit?
The full converter handles length, mass, volume, area, speed and temperature — with every metric and US/UK unit in one place.
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