Accurate US gallon to liter converter for American fuel, cooking, and everyday needs. Convert US gallons to liters for gas mileage (MPG), cooking measurements, water tanks, and container sizes. American gallon is different from UK gallon.
Convert US gallons to liters using the official US customary standard conversion factor of 1 US gallon = 3.785411784 liters. Perfect for American fuel economy, cooking, and everyday volume conversions.
Accurate US gallon to liter converter for American fuel, cooking, and everyday needs. Convert US gallons to liters for gas mileage (MPG), cooking measurements, water tanks, and container sizes. American gallon is different from UK gallon.
Convert US gallons to liters using the official US customary standard conversion factor of 1 US gallon = 3.785411784 liters. Perfect for American fuel economy, cooking, and everyday volume conversions.
High precision needed for fuel economy calculations and industrial applications. Daily use (filling gas tank, buying water) can use whole numbers. Remember: 1 US gallon = 3.785L, 1 UK gallon = 4.546L.
Common mistake: Confusing US gallons with UK gallons. A UK gallon (4.546L) is about 20% larger than a US gallon (3.785L). Using the wrong gallon type causes significant errors in fuel economy and volume calculations. Always use US gallons for American measurements.
| Item | US Gallons | Liters |
|---|---|---|
| Milk jug | 1 | 3.79 |
| Water bottle | 0.5 | 1.89 |
| 5 gal bucket | 5 | 18.93 |
| Gas tank (car) | 15 | 56.78 |
| 55gal drum | 55 | 208.19 |
| 10gal aquarium | 10 | 37.85 |
| Swimming pool | 10000 | 37854.12 |
1 US gallon equals approximately 3.785 liters. The exact conversion is 1 US gal = 3.785411784 liters.
US gallon is smaller (3.785L) than UK gallon (4.546L). Always use US gallons for American measurements, cooking, and fuel economy.
5 US gallons equals approximately 18.93 liters. This is a common size for water jugs in the US.
10 US gallons equals approximately 37.85 liters. This is about the size of a small aquarium.
For American cooking, 1 US gallon = 3.785 liters. Many recipes use US gallons for large batch cooking and canning.
1 US gallon equals 4 US quarts. 1 quart = 0.946 liters.
Gallons are part of the US customary system and remain the standard for fuel measurement and fuel economy (MPG - miles per gallon).
US customary volume units: 1 gallon = 4 quarts = 8 pints = 16 cups = 128 fluid ounces. 1 US gallon = 3.785 liters.
Last Updated: 2026 · Reviewed by the UnitFig editorial team