Convert gallons to liters instantly. Enter any gallon value and get the exact liter equivalent, plus the formula and a full reference table.
The conversion factor is derived from SI base values:
This converter uses US liquid gallons (3.78541 L). The UK imperial gallon = 4.54609 L.
| Gallons (gal) | Liters (L) |
|---|---|
| 1 gal | 3.7854 L |
| 2 gal | 7.5708 L |
| 3 gal | 11.356 L |
| 5 gal | 18.927 L |
| 10 gal | 37.854 L |
| 15 gal | 56.781 L |
| 20 gal | 75.708 L |
| 30 gal | 113.56 L |
| 50 gal | 189.27 L |
| 100 gal | 378.54 L |
1 US gallon = 3.78541 liters. This is the exact defined value. To convert gallons to liters, multiply by 3.78541.
5 gallons = 5 × 3.78541 = 18.927 liters. A standard 5-gallon water cooler bottle holds just under 19 liters.
No. The US liquid gallon = 3.785 L, while the UK imperial gallon = 4.546 L. The US dry gallon (4.405 L) is a third variant used for dry goods. This converter uses the US liquid gallon.
20 liters ÷ 3.78541 = 5.283 US gallons. Use the reverse converter to convert liters to gallons.
The US liquid gallon is defined as exactly 231 cubic inches, which equals 3.785411784 liters. It dates back to the English wine gallon standardized by Queen Anne in 1707.