US Gallon to Liter Conversion Chart
| US Gallon (gallon) | Liter (litres) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 0.1 gallon | 0.3785 litres | Small Engine Two-Stroke Fuel Mixture Cup | 0.1 × 3.78541 = 0.3785 l |
| 0.25 gallon | 0.9464 litres | One US Liquid Quart Lubricating Motor Oil Bottle | 0.25 × 3.78541 = 0.9464 l |
| 0.5 gallon | 1.8927 litres | Half-Gallon Fresh Dairy Milk Jug | 0.5 × 3.78541 = 1.8927 l |
| 1 gallon | 3.7854 litres | Exact International Statutory US Liquid Gallon Jug | 1 × 3.78541 = 3.7854 l |
| 2 gallon | 7.5708 litres | Double Gallon Commercial Beverage Jug | 2 × 3.78541 = 7.5708 l |
| 3 gallon | 11.3562 litres | Marine Outboard Auxiliary Fuel Tank | 3 × 3.78541 = 11.3562 l |
| 5 gallon | 18.9271 litres | Commercial Office Water Dispenser Carboy Bottle | 5 × 3.78541 = 18.9271 l |
| 10 gallon | 37.8541 litres | Dual Emergency Fuel Transport Jerrycans | 10 × 3.78541 = 37.8541 l |
| 15 gallon | 56.7812 litres | Compact Passenger Automobile Fuel Tank | 15 × 3.78541 = 56.7812 l |
| 20 gallon | 75.7082 litres | Full-Size Sedan Long-Distance Fuel Tank | 20 × 3.78541 = 75.7082 l |
| 25 gallon | 94.6353 litres | Commercial Lawn Care Agricultural Sprayer | 25 × 3.78541 = 94.6353 l |
| 50 gallon | 189.271 litres | Standard Industrial Heavy Drum Barrel | 50 × 3.78541 = 189.271 l |
| 100 gallon | 378.541 litres | Residential Rainwater Harvesting Basin | 100 × 3.78541 = 378.541 l |
| 250 gallon | 946.353 litres | Intermediate Bulk Container Tote Payload | 250 × 3.78541 = 946.353 l |
| 500 gallon | 1892.71 litres | Agricultural Liquid Bulk Transport Trailer | 500 × 3.78541 = 1892.71 l |
US Gallon to Liter Formula & Unit Definitions
One US gallon equals approximately 3.78541178 liters. To convert US gallons to liters, multiply by 3.78541178. For reverse conversions from liters to US gallons, divide by 3.78541178 (or multiply by 0.26417205).
Quick Estimation: To mentally estimate liters from US gallons, multiply by 4 and subtract roughly 5%. For example, 10 gal × 4 = 40, minus 5% gives ~38 L (actual: 37.85 L).
US Gallon Scale (gal)
US Customary Liquid Standard- Creator & Origin: Derived from the medieval English Queen Anne wine gallon of 1707 (231 cu in).
- Standard Definition: Defined by NIST as exactly 231 cubic inches (3.785411784 liters).
- Everyday Focus: Gasoline pumps, milk jugs, paint containers, and residential water heaters.
Liter Scale (L)
Accepted Non-SI Metric Unit- Creator & Origin: Defined in France in 1795 as 1 cubic decimeter (1 dm³).
- Standard Definition: Recognized by BIPM as equal to exactly 0.001 cubic meters (1 dm³).
- Everyday Focus: Beverage containers, fuel dispensing, vehicle tanks, and lab measurements.
Frequently Asked Questions
Q.How many liters are in one US gallon?
One US liquid gallon equals approximately 3.78541178 liters (exact: 231 cubic inches). Conversely, 1 liter equals approximately 0.26417205 US gallons.
Q.What is the formula to convert US gallons to liters?
The formula is: Liters = US Gallons × 3.78541178. For example, 10 gal × 3.78541 ≈ 37.85 L.
Q.How do I reverse this calculation from liters to US gallons?
To convert liters back to US gallons, divide by 3.78541178 (or multiply by 0.26417205). You can also use our Liter to US Gallon Converter.
Q.Why does 1 US gallon equal exactly 231 cubic inches?
The 231-cubic-inch standard was enacted in 1707 under Queen Anne for taxing wine imports in England, and it was adopted unchanged by the fledgling United States in 1790.