UnitConGallons to Liters Converter
Convert US gallons to liters for fuel comparison, beverage sizing, and aquarium or pool volume estimates. This conversion is essential when comparing US-market fuel economy (mpg) with metric fuel consumption (L/100km).
Formula
Multiply US gallons by 3.78541 to get liters. To reverse, divide liters by 3.78541 to get US gallons.
Quick reference
| US Gallon (US_gal) | Liter (L) |
|---|---|
| 1 | 3.785412 |
| 2 | 7.570824 |
| 5 | 18.92706 |
| 10 | 37.85412 |
| 15 | 56.78118 |
| 20 | 75.70824 |
| 25 | 94.63529 |
| 50 | 189.2706 |
| 100 | 378.5412 |
| 200 | 757.0824 |
About these units
US Gallon
The US gallon was standardized at 231 cubic inches in 1824 and formally fixed at 3.785411784 liters in 1959. It is used for fuel, beverages, and liquid container labeling throughout the United States.
Liter
The liter (1 cubic decimeter = 0.001 m³) is the metric unit for liquid volume globally. Fuel prices at European pumps are quoted per liter, making gallon-to-liter conversion necessary for US travelers.
Frequently asked questions
5 × 3.78541 ≈ 18.93 liters.
20 ÷ 3.78541 ≈ 5.28 US gallons.
Most US passenger cars have tanks of 12-18 gallons = approximately 45-68 liters.