Gallons to Liters Converter
Quickly convert US gallons to liters for recipes, fuel conversions, and tank sizing. See results instantly as you type.
Last updated: May 2026
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Volume Fill Visualization
Capacity: 10 gal — Average car fuel tank
How to convert gallons to liters
Enter a value in the gallons field to instantly see the equivalent in liters. The formula is: liters = gallons × 3.78541. The reverse: gallons = liters × 0.264172. One US gallon equals approximately 3.785 liters. This converter uses US gallons, not UK (Imperial) gallons, which are about 20% larger.
Common reference values
| US Gallons | Liters | Typical use |
|---|---|---|
| 1 gal | 3.785 L | Small water pitcher |
| 5 gal | 18.93 L | Large water jug |
| 10 gal | 37.85 L | Small fuel can or bucket |
| 20 gal | 75.71 L | Standard fuel can |
| 50 gal | 189.27 L | Large water heater |
| 100 gal | 378.54 L | Small industrial tank |
Understanding gallons and liters
Liters are the metric volume unit, used worldwide for liquids and gases. US gallons are used primarily in the United States for fuel, milk, and other liquids. One US gallon equals exactly 3.785411784 liters. UK (Imperial) gallons differ at 4.546 liters each and are larger than US gallons. Always verify which gallon system applies before converting.
When You'll Need This Conversion
Use this converter for: Converting US recipes to metric, calculating fuel economy and tank capacity, comparing product sizes between regions, sizing containers and aquariums.
Frequently Asked Questions
How many liters is a typical car fuel tank?
A compact car typically holds 40–55 liters (10.5–14.5 US gallons). A family sedan holds 55–70 liters (14.5–18.5 US gallons). SUVs and trucks range from 75–100 liters (19.8–26.4 US gallons). Use this converter to quickly find your vehicle's fuel capacity in liters if the manual lists gallons.
What's the difference between US and UK gallons?
One US gallon = 3.785 liters. One UK (Imperial) gallon = 4.546 liters. UK gallons are about 20% larger. This converter uses US gallons. If you see a UK source, multiply by 4.546 instead of 3.785.
A recipe calls for 2 gallons of water — how many liters?
2 US gallons = 7.57 liters. Common conversions: 0.5 gal = 1.89 L, 1 gal = 3.785 L, 2 gal = 7.57 L, 5 gal = 18.93 L. Write the liter amount on your recipe card for next time.
How much is 5 gallons in liters?
5 US gallons = 18.927 liters (approximately 19 L). A 5-gallon bucket is a common measurement in the US. In metric countries, a 20-liter container is standard instead.
Does this converter work for all liquids?
Yes. The conversion factor 3.78541 applies to all liquids (water, milk, fuel, oil). Volume conversion is the same regardless of liquid type.
What if I see gallons on a US label but need liters?
Multiply the gallon amount by 3.785. For example: 1 gal milk = 3.785 L, 2.5 gal paint = 9.46 L. Use this converter for quick, accurate results.