Direct answer
Converting liters into US liquid gallons
Multiply liters by 0.2641720524 to calculate US liquid gallons. For example, 20 liters multiplied by 0.2641720524 equals approximately 5.28344 US gallons.
You can obtain the same result by dividing liters by 3.785411784, the exact number of liters in one US liquid gallon.
The conversion is useful for fuel tanks, aquariums, water containers, beverage volumes, household products, liquid storage, packaging, and international equipment specifications.
Enter any positive whole or decimal liter value for an instant US-gallon result.
Standard calculations
Liters-to-US-gallons conversion formulas
Multiply the complete liter measurement by the gallon-per-liter factor.
Divide by the exact number of liters in one US liquid gallon.
Both formulas represent the same conversion relationship. The multiplication factor is approximately the reciprocal of 3.785411784.
The US-gallon number should be smaller than the liter number because one US gallon contains more than one liter.
Manual method
How to convert liters to US gallons step by step
Use 18 liters as an example.
- 01
Write the liter measurement
Begin with 18 liters and preserve any decimal places included in the original value.
- 02
Multiply by 0.2641720524
Calculate 18 × 0.2641720524.
- 03
Read the calculated gallons
The unrounded result is approximately 4.7550969432 US gallons.
- 04
Round the final result
To two decimal places, 18 liters equals approximately 4.76 US gallons.
Worked calculations
Examples of converting liters to US gallons
Convert 1 liter
One liter equals approximately 0.264172 US gallon.
Convert 5 liters
Five liters equals approximately 1.32086 US gallons.
Convert 10 liters
Ten liters equals approximately 2.64172 US gallons.
Convert 50 liters
Fifty liters equals approximately 13.2086 US gallons.
Convert 100 liters
One hundred liters equals approximately 26.4172 US gallons.
Quick reference
Common liter-to-US-gallon conversions
| Liters | US gallons | Rounded value |
|---|---|---|
| 1 L | 0.264172 US gal | 0.26 gal |
| 2 L | 0.528344 US gal | 0.53 gal |
| 3 L | 0.792516 US gal | 0.79 gal |
| 5 L | 1.320860 US gal | 1.32 gal |
| 10 L | 2.641721 US gal | 2.64 gal |
| 15 L | 3.962581 US gal | 3.96 gal |
| 20 L | 5.283441 US gal | 5.28 gal |
| 25 L | 6.604301 US gal | 6.60 gal |
| 50 L | 13.208603 US gal | 13.21 gal |
| 100 L | 26.417205 US gal | 26.42 gal |
Decimal measurements
How to convert decimal liters
Use the complete decimal measurement in the formula and round only the final US-gallon result.
Convert 2.5 liters
Two and one-half liters equals approximately 0.66043 US gallon.
Convert 18.5 liters
Rounded to two decimal places: approximately 4.89 US gallons.
Do not change 18.5 liters to 19 liters before converting. That would produce a different result.
Unit identification
Make sure the required unit is a US liquid gallon
The word gallon can refer to a US liquid gallon, imperial gallon, or US dry gallon. These units are not interchangeable.
Used by this conversion
Larger gallon unit
Not a liquid gallon
A container listed simply as “gallons” may require context to determine which gallon standard is intended.
Reporting precision
How should US-gallon results be rounded?
Two decimal places are often suitable for everyday comparisons. Fuel, laboratory, commercial, or technical calculations may require more detail.
Readable approximate value
Useful for many applications
Follow the specification
Keep additional digits during multiplication and round only the final result. A conversion cannot improve the precision of the original volume measurement.
Accuracy check
Common liters-to-US-gallons mistakes
Multiplying liters by 3.785411784
Multiplication by 3.785411784 converts US gallons to liters. To convert liters to gallons, divide by that number.
Using an imperial-gallon factor
The imperial gallon is larger and requires a different conversion.
Rounding liters before converting
Keep the complete original liter value until the calculation is finished.
Confusing volume with weight
Liters and gallons measure volume. Converting the volume does not determine the liquid's weight without density information.
Continue reading
Related liters-to-US-gallons guides
Questions and answers
Frequently asked questions
How do I convert liters to US gallons?
Multiply liters by approximately 0.2641720524 or divide liters by 3.785411784.
What is 10 liters in US gallons?
Ten liters equals approximately 2.64172 US gallons.
What is 20 liters in US gallons?
Twenty liters equals approximately 5.28344 US gallons.
Does this formula convert to imperial gallons?
No. It converts liters to US liquid gallons.
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