One US gallon is 3.78541 liters. Fuel economy, milk and paint in the US are sold by the gallon; almost everywhere else by the liter — and note the UK (imperial) gallon is a different, larger unit (4.546 L).
Where you'll meet this conversion
- A 15-gallon fuel tank holds 56.8 L.
- A gallon of milk is 3.79 L — about 3¾ one-liter cartons.
- 30 mpg (US) is about 7.8 L/100 km.
Common mistake
Using the US factor for a British recipe or car manual. Imperial gallon = 4.546 L, 20% more.
Quick answer: one us gallon equals 3.7854 liters. So to convert US gallons to liters, multiply by 3.78541178.
How to convert US gallons to liters
liters = US gallons × 3.785411784
The US gallon is exactly 3.785411784 liters. American fuel prices are quoted per gallon, making this one of the most practical conversions for travelers.
The liter (1,000 cubic centimeters) is the everyday metric volume: bottled water, fuel and engine displacement are all sold by the liter.
US gallon to Liter conversion table
| US gallon (gal) | Liter (L) |
|---|---|
| 0.01 gal | 0.037854 L |
| 0.1 gal | 0.378541 L |
| 0.25 gal | 0.946353 L |
| 0.4 gal | 1.5142 L |
| 0.75 gal | 2.8391 L |
| 1.25 gal | 4.7318 L |
| 1.75 gal | 6.6245 L |
| 2.5 gal | 9.4635 L |
| 3.5 gal | 13.2489 L |
| 4.5 gal | 17.0344 L |
| 6 gal | 22.7125 L |
| 8 gal | 30.2833 L |
| 10 gal | 37.8541 L |
| 12 gal | 45.4249 L |
| 14 gal | 52.9958 L |
| 16 gal | 60.5666 L |
| 18 gal | 68.1374 L |
| 20 gal | 75.7082 L |
| 24 gal | 90.8499 L |
| 26 gal | 98.4207 L |
| 30 gal | 113.5624 L |
| 35 gal | 132.4894 L |
| 45 gal | 170.3435 L |
| 55 gal | 208.1976 L |
| 65 gal | 246.0518 L |
| 75 gal | 283.9059 L |
| 85 gal | 321.76 L |
| 95 gal | 359.6141 L |
| 110 gal | 416.3953 L |
| 125 gal | 473.1765 L |
| 175 gal | 662.4471 L |
| 250 gal | 946.3529 L |
| 350 gal | 1,324.89 L |
| 450 gal | 1,703.44 L |
| 600 gal | 2,271.25 L |
| 750 gal | 2,839.06 L |
| 900 gal | 3,406.87 L |
| 1,500 gal | 5,678.12 L |
| 2,500 gal | 9,463.53 L |
| 10,000 gal | 37,854.12 L |
Need the opposite direction? Use the Liter to US gallon converter, or read our complete guide to volume conversions for every formula in one place.
Frequently asked questions
How many liters are in one us gallon?
One us gallon equals 3.7854 liters. Multiply any us gallon value by 3.78541178 to get liters.
What is 10 US gallons in liters?
10 US gallons equal 37.8541 liters (10 × 3.785412).
Is the us gallon to liter conversion exact?
The conversion factor used here (3.785411784) is based on the internationally agreed definitions of both units, so results are exact up to rounding of the final decimal places.
Is my data stored when I use this converter?
No. The conversion runs entirely in your browser with JavaScript — nothing you type is sent to a server, logged or stored.