Direct comparison
What is the difference between liters and US gallons?
Liters and US gallons both measure volume, but a US liquid gallon is larger. One US gallon equals exactly 3.785411784 liters, while one liter equals approximately 0.264172 US gallon.
The liter belongs to the metric system and is widely used internationally. The US liquid gallon belongs to the US customary system and is commonly used in the United States.
Both units can describe fuel, water, beverages, tank capacity, liquid products, aquariums, and storage containers.
Enter a whole or decimal liter value for an instant US-gallon result.
Unit comparison
Liters and US gallons at a glance
| Feature | Liter | US liquid gallon |
|---|---|---|
| Common symbol | L | US gal |
| Measurement system | Metric | US customary |
| Size | Smaller | Larger |
| Liter relationship | 1 L | 3.785411784 L |
| US-gallon relationship | 0.264172 US gal | 1 US gal |
| Common use | International volume measurement | US liquid-volume measurement |
Unit meanings
What is a liter?
A liter is a metric volume unit equal to exactly 1,000 milliliters. It is also equal to one cubic decimeter.
Milliliter relationship
Cubic-decimeter relationship
Cubic-meter relationship
What is a US liquid gallon?
A US liquid gallon is a US customary volume unit equal to exactly 231 cubic inches. It contains 4 US liquid quarts, 8 US liquid pints, 16 US customary cups, or 128 US fluid ounces.
Quart relationship
Pint relationship
Fluid-ounce relationship
Relative volume
Which is larger: a liter or a US gallon?
One US liquid gallon is larger than one liter. It contains approximately 3.785 liters.
One gallon can hold almost four liters.
Four liters is slightly more than one US gallon:
The difference is approximately 0.05669 gallon.
When liters are converted to US gallons, the numerical result should normally become smaller.
Changing units
How to convert between liters and US gallons
You can also divide liters by 3.785411784.
Multiply the gallon value by the exact liter factor.
For example, 20 liters equals approximately 5.28344 US gallons. In the opposite direction, 5 US gallons equals approximately 18.9271 liters.
Where the units appear
Common uses of liters and US gallons
| Application | Liters | US gallons |
|---|---|---|
| Vehicle fuel tanks | Common internationally | Common in the United States |
| Fuel purchases | Price per liter | Price per gallon |
| Aquariums | Metric tank capacities | US-market tank capacities |
| Water storage | Metric containers and tanks | US containers and tanks |
| Beverages | Bottles and bulk volumes | Large US containers |
| Household products | Metric labels | US customary labels |
Everyday comparisons
Practical liters-versus-gallons examples
More than one-quarter gallon
More than one-half gallon
Slightly more than one gallon
About 2.64 gallons
Common container reference
Large tank reference
Important distinction
US gallons are not the same as imperial gallons
A US liquid gallon and an imperial gallon use different definitions. The imperial gallon is larger.
| Gallon type | Liters per gallon | One liter in gallons |
|---|---|---|
| US liquid gallon | 3.785411784 L | 0.264172 US gal |
| Imperial gallon | 4.54609 L | 0.219969 imp gal |
| US dry gallon | Different dry-volume definition | Not used for liquid conversion |
Fuel economy, tank capacity, and imported product specifications can produce incorrect comparisons when US and imperial gallons are mixed.
Measurement accuracy
Does changing the unit change the volume?
No. Conversion changes only the numerical description and unit label. The physical volume remains the same.
A container holding 20 liters still holds the same amount when described as approximately 5.28344 US gallons.
The converted number is only as accurate as the original measurement. Extra decimal digits do not correct an inaccurate container label, gauge, or measuring device.
Accuracy check
Common liters-and-gallons mistakes
Assuming one gallon equals four liters exactly
One US gallon equals approximately 3.78541 liters, not exactly four liters.
Mixing US and imperial gallons
The two gallon units have different volumes and conversion factors.
Confusing volume with mass
Liters and gallons measure volume. The weight of the liquid depends on its density.
Using the reverse conversion factor
Multiply liters by about 0.264172, not by 3.785411784.
Continue reading
Related liters-to-US-gallons guides
Questions and answers
Frequently asked questions
Which is larger, a liter or a US gallon?
A US liquid gallon is larger and equals exactly 3.785411784 liters.
How many US gallons are in one liter?
One liter equals approximately 0.264172 US liquid gallon.
Are US and imperial gallons the same?
No. The imperial gallon is larger than the US liquid gallon.
Do liters and gallons measure weight?
No. They measure volume.
Convert a volume
Use the Liters to US Gallons Converter
Enter any positive whole or decimal liter measurement to calculate US liquid gallons instantly.
Open Liters to US Gallons ConverterLast updated: July 27, 2026