Unit Converter › Guides › US gallons to Liters (gal to L)
Convert us gallons to liters with the exact factor defined by NIST (3.785411784), a ready table and worked examples.
A U.S. liquid gallon is defined as 231 cubic inches, which equals exactly 3.785 411 784 L. The imperial (UK) gallon is different: 4.546 09 L.
Liters = US gallons × 3.785411784. To convert us gallons to liters, multiply by 3.785411784.
| US gallons | Liters |
|---|---|
| 1 | 3.785 |
| 2 | 7.571 |
| 3 | 11.356 |
| 5 | 18.927 |
| 10 | 37.854 |
| 12 | 45.425 |
| 13 | 49.21 |
| 15 | 56.781 |
| 20 | 75.708 |
| 25 | 94.635 |
| 50 | 189.271 |
| 55 | 208.198 |
| 100 | 378.541 |
Values are rounded to 3 decimal places for display. The factor itself is exact, so any rounding comes only from the last digit shown.
A 15 US gal fuel tank holds 56.781 L. The same number of imperial gallons would be 68.191 L, about 20% more.
No. An imperial (UK) gallon is 4.54609 L and a US gallon is 3.785411784 L. Always check which one a figure uses.
Last checked: 29 October 2026.