US Gallons to Liters Converter
Enter a value to instantly convert between volume units.
1 US Gallon = 3.7854 Liter
Key Formulas
Liter → US Gallon
gal = L × 0.264172US Gallon → Liter
L = gal × 3.78541US Cup → Milliliter
mL = cup × 236.588Milliliter → US Cup
cup = mL × 0.00422675Formula
L = US gal × 3.785411784This converter uses the US liquid gallon, equal to 3.785411784 liters in the conversion engine. It is useful when a fuel receipt, aquarium, storage tank, or product container is labeled in US gallons but another document uses liters. The imperial gallon is 4.54609 L, so do not use this factor for a UK or imperial-gallon measurement.
Source: NIST SP 811, Appendix B.8
Reviewed by the Convert Calc editorial team · Last reviewed: · see our methodology
Frequently Asked Questions
Real-World Examples
A one-US-gallon container holds 3.78541 L. It also contains 128 US fluid ounces or 16 US cups.
1 gal = 3.78541 L
A fuel receipt showing 5 US gallons is converted to 18.9271 L for a metric expense record.
5 gal = 18.9271 L
Ten US gallons added to a tank correspond to 37.8541 L on its metric capacity chart.
10 gal = 37.8541 L
The nominal capacity of a 55-US-gallon drum converts to 208.198 L. Actual usable volume can depend on the specific drum.
55 gal = 208.198 L