Direct answer
How do you convert liters to US gallons?
Multiply liters by 0.2641720524 to calculate US liquid gallons. For example, 10 liters multiplied by 0.2641720524 equals approximately 2.64172 US gallons.
Alternative method: US gallons = liters ÷ 3.785411784
Volume units
Understanding liters and US gallons
The liter is a metric volume unit. One liter contains exactly 1,000 milliliters and is equal to one cubic decimeter.
The US liquid gallon is used primarily in the United States for fuel, beverages, water, household products, containers, and other liquid volumes.
One US liquid gallon contains exactly 3.785411784 liters. Because a gallon is larger than a liter, the numerical value becomes smaller when liters are converted to US gallons.
Metric volume relationship
Exact liter relationship
Approximate gallon equivalent
Calculation method
Liters-to-US-gallons conversion formula
Multiply the complete liter measurement by the gallon-per-liter conversion factor.
Divide by the number of liters in one US gallon.
Both methods produce the same result. Multiplication is often convenient in calculators and spreadsheets, while division can be intuitive when thinking about how many 3.785-liter gallon units fit into a volume.
A liter value normally becomes a smaller number when converted to US gallons.
Step-by-step method
How to convert liters to US gallons manually
- 01
Write the complete liter measurement
Keep all decimal places from the original measurement. For example, use 18.5 liters rather than rounding it to 19 liters.
- 02
Multiply by 0.2641720524
Calculate 18.5 × 0.2641720524.
- 03
Read the US-gallon result
The result is approximately 4.88718 US gallons.
- 04
Round according to the purpose
A general result may be written as 4.89 US gallons. Fuel, laboratory, manufacturing, or technical work may require different precision.
Worked calculations
Liters-to-US-gallons examples
Example 1: Convert 1 liter
1 × 0.2641720524 = 0.2641720524 US gal
One liter equals approximately 0.264172 US gallon.
Example 2: Convert 5 liters
5 × 0.2641720524 = 1.320860262 US gal
Five liters equals approximately 1.32086 US gallons.
Example 3: Convert 20 liters
20 × 0.2641720524 = 5.283441048 US gal
Twenty liters equals approximately 5.28344 US gallons.
Example 4: Convert 100 liters
100 × 0.2641720524 = 26.41720524 US gal
One hundred liters equals approximately 26.4172 US gallons.
Related US volume units
Converting the result to gallons, quarts, and ounces
One US liquid gallon contains 4 US liquid quarts, 8 US liquid pints, 16 US cups, and 128 US fluid ounces.
Quarter-gallon divisions
Eight equal pint units
Fluid-ounce relationship
Suppose 10 liters equals approximately 2.64172 US gallons. Multiplying by 4 gives approximately 10.5669 US quarts.
Multiplying by 128 gives approximately 338.14 US fluid ounces.
Reference values
Liters-to-US-gallons conversion table
The table includes common volumes used for fuel, water, aquariums, storage tanks, containers, and household products.
| Liters | US liquid gallons |
|---|---|
| 0.5 L | 0.1321 US gal |
| 1 L | 0.2642 US gal |
| 2 L | 0.5283 US gal |
| 3 L | 0.7925 US gal |
| 3.78541 L | 1 US gal |
| 5 L | 1.3209 US gal |
| 10 L | 2.6417 US gal |
| 15 L | 3.9626 US gal |
| 20 L | 5.2834 US gal |
| 25 L | 6.6043 US gal |
| 30 L | 7.9252 US gal |
| 40 L | 10.5669 US gal |
| 50 L | 13.2086 US gal |
| 75 L | 19.8129 US gal |
| 100 L | 26.4172 US gal |
| 200 L | 52.8344 US gal |
| 500 L | 132.0860 US gal |
| 1,000 L | 264.1721 US gal |
Mental estimation
How to estimate liters in US gallons
A quick estimate divides liters by 4. This is easy to calculate but gives a result slightly below the standard conversion because one US gallon contains about 3.785 liters rather than exactly 4 liters.
Easy but slightly low
Useful mental approximation
More precise result
For 20 liters, division by 4 gives 5 gallons. The standard conversion gives approximately 5.28344 US gallons.
Everyday uses
When liter-to-US-gallon conversion is useful
Fuel and vehicle tanks
Vehicle specifications and fuel purchases may use liters internationally, while US capacity figures commonly use gallons.
Aquariums and ponds
Tank capacities, pumps, filters, water treatments, and equipment recommendations may be listed in liters or US gallons.
Water storage
Barrels, tanks, emergency supplies, rainwater containers, and household storage systems may require conversion between metric and US units.
Beverages and food products
Bulk liquids, commercial ingredients, drink containers, and imported product labels may report volume in liters.
Shipping and manufacturing
Packaging, container capacity, liquid products, and equipment specifications may use different volume systems.
Important unit distinction
US gallons and imperial gallons are different
The word gallon can refer to more than one unit. This calculator uses the US liquid gallon.
Used for this converter
Larger than a US gallon
Not used for liquid conversion
Using the imperial-gallon factor for a US-gallon conversion produces an incorrect answer.
Precision and measurement
How many decimal places should be used?
Two decimal places are often sufficient for household and general volume comparisons. Fuel, laboratory, industrial, chemical, or manufacturing work may require more precision.
Readable approximate value
Suitable for many uses
Follow the specification
Keep additional digits during the calculation and round only the final result. A conversion does not make the original measurement more accurate.
Common errors
Liter-to-US-gallon mistakes to avoid
Using the imperial gallon
Confirm whether the required unit is a US liquid gallon or an imperial gallon.
Multiplying by 3.785
Multiplication by 3.785 converts US gallons to liters. Liters to gallons uses division by 3.785.
Rounding liters first
Keep the complete decimal liter value until the final result is calculated.
Confusing volume and weight
Liters and gallons measure volume. The weight of that volume depends on the substance.
Liters-to-US-gallons cluster
Related liters-to-US-gallons guides
Use these guides for formulas, common values, fuel, aquariums, water storage, gallon types, decimal measurements, tables, and mental estimation.
- 01 How to Convert Liters to US Gallons ↗
- 02 Liters to US Gallons Formula Explained ↗
- 03 How Many US Gallons Are in a Liter? ↗
- 04 Liters vs US Gallons ↗
- 05 Common Liter-to-US-Gallon Conversions ↗
- 06 Convert Fuel from Liters to US Gallons ↗
- 07 Convert Aquarium Liters to US Gallons ↗
- 08 Convert Water Volume from Liters to US Gallons ↗
- 09 How to Convert Decimal Liters to US Gallons ↗
- 10 Liters to US Gallons Conversion Table ↗
- 11 Estimate Liters to US Gallons Without a Calculator ↗
- 12 US Gallons vs Imperial Gallons ↗
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Questions and answers
Liters-to-US-gallons FAQs
What is the formula for converting liters to US gallons?
Multiply liters by approximately 0.2641720524. You can also divide liters by 3.785411784.
How many US gallons are in one liter?
One liter equals approximately 0.264172 US gallon.
How many liters are in one US gallon?
One US liquid gallon equals exactly 3.785411784 liters.
What is 5 liters in US gallons?
Five liters equals approximately 1.32086 US gallons.
What is 20 liters in US gallons?
Twenty liters equals approximately 5.28344 US gallons.
What is 100 liters in US gallons?
One hundred liters equals approximately 26.4172 US gallons.
Are US gallons and imperial gallons the same?
No. A US liquid gallon is smaller than an imperial gallon, so the conversion factors are different.
Can this converter handle decimal liter values?
Yes. It accepts positive whole and decimal liter measurements.
Convert another volume
Calculate liters in US gallons
Return to the converter and enter any positive whole or decimal liter measurement.
Use Liters to US Gallons ConverterLast updated: July 27, 2026