Volume conversion
US gallons to Litres (gal to L)
Check the litre capacity of a container labelled in US liquid gallons. Confirm US on the specification before using the result.
1 gal ≈ 3.7854 L — the calculator keeps the stored factor; this summary may be rounded.
A can with a stated capacity of 5 US gal
- Starting measurement
- 5 gal
- Converted value (rounded if needed)
- 18.9271 L
The converted number is its stated capacity, not necessarily the amount currently inside it. A UK imperial-gallon container would give a different result.
US gallons to Litres conversion chart
| US gallons | litres |
|---|---|
| 1 gal | 3.7854 L |
| 2 gal | 7.5708 L |
| 3 gal | 11.3562 L |
| 4 gal | 15.1416 L |
| 5 gal | 18.9271 L |
| 6 gal | 22.7125 L |
| 7 gal | 26.4979 L |
| 8 gal | 30.2833 L |
| 9 gal | 34.0687 L |
| 10 gal | 37.8541 L |
| 12 gal | 45.4249 L |
| 15 gal | 56.7812 L |
| 18 gal | 68.1374 L |
| 20 gal | 75.7082 L |
| 25 gal | 94.6353 L |
| 30 gal | 113.562 L |
| 40 gal | 151.416 L |
| 50 gal | 189.271 L |
| 60 gal | 227.125 L |
| 75 gal | 283.906 L |
| 100 gal | 378.541 L |
How to convert by hand
Reference relationship (display may be rounded)
1 gal (US) = 3.78541178 L
- Multiply the amount in US gallons by the number of litres per unit.
- Use the calculator for the stored precision; copying a short displayed factor introduces extra rounding.
- Round the result to suit your measurement, after completing the calculation.
Related conversions
About US gallons and litres
Check the measurement system as well as the unit name. These pair pages use US liquid gallons and US fluid ounces. Choose an explicitly UK unit in the full converter for imperial measures.
US liquid gallon
US customary231 cubic inches, or about 3.785 litres. This is the US liquid gallon, smaller than the imperial gallon; it is not the US dry gallon.
Commonly used for: US fuel quantities, milk containers and liquid tank capacities.
Litre
MetricOne cubic decimetre, or 1,000 millilitres. L and the spelling liter refer to the same unit.
Commonly used for: Bottle capacities, fuel volumes and liquid recipe quantities.
Questions
Does this page include US dry gallons?
No. It uses US liquid gallons for liquids and liquid-container capacities. A dry gallon and a UK imperial gallon are separate definitions; choose a reference that explicitly matches the original unit.
How do I convert litres back to US gallons?
Enter the value in the litres field above to work backwards, or open the Litres to US gallons converter. This uses the stored factors rather than dividing by a rounded number copied from the chart.
Why might the chart and calculator show different decimal places?
The chart uses a compact rounded display. The editable calculator can show up to six decimal places and uses the factors or temperature formulas stored in the library. More displayed digits do not make the original measurement more precise.
Precision and source
The calculator uses stored conversion factors and temperature formulas, then rounds the result for display. A short decimal in a chart is not a claim of exactness. For a calculation with several steps, keep as much precision as the original measurement supports and round at the end.
Reference: NIST SP 811 conversion factors. Its alphabetical tables distinguish unit variants and temperature readings from intervals. Published by ToolsNow. Report a conversion problem.
Need a different unit?
The full converter handles length, mass, volume, area, speed and temperature, including separate choices for US and UK liquid measures.
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