A gallon is ambiguous without a system
Ten US gallons and ten Imperial gallons differ by more than 7.6 litres.
Unit converter
Gallons to Litres Converter
Convert US gallons to litres instantly. Confirm which gallon you mean. See the formula, worked examples and practical reference values.
How to convert US gal to L
This page converts US liquid gallons to litres for fuel, containers and capacity. An Imperial gallon has a different volume.
Formula: L = US gal × 3.785412
Reverse formula: US gal = L × 0.264172
Worked example
1 US gal = 3.785412 L
- = 3,785.411784 mL
- = 16 US cup
- = 128 US fl oz
Avoid these errors
Common mistakes
Dry gallons are not liquid gallons
This converter uses US liquid gallons, not the less common US dry gallon.
Useful for: US liquid gallons converted to metric litres.
Common US gal to L conversions
| US gallons | litres |
|---|---|
| 1 US gal | 3.785412 L |
| 2 US gal | 7.570824 L |
| 5 US gal | 18.927059 L |
| 10 US gal | 37.854118 L |
| 20 US gal | 75.708236 L |
| 50 US gal | 189.270589 L |
| 100 US gal | 378.541178 L |
About the units
A US gallon is an US customary unit represented by US gal. A litre is a metric unit represented by L. Calculations use the same authoritative registry as the full volume converter, retaining full precision until display.
Sources and definitions
NIST — SI units and conversion guidance
Conversion constants come from the shared EzyCalculator unit registry. See how calculations are reviewed and tested.