1 US Gallon equals 3.78541 Liters.
| US Gallon (gal) | Liter (L) |
|---|---|
| 0.001 gal | 0.00378541 L |
| 0.01 gal | 0.0378541 L |
| 0.1 gal | 0.378541 L |
| 1 gal | 3.78541 L |
| 2 gal | 7.57082 L |
| 5 gal | 18.9271 L |
| 10 gal | 37.8541 L |
| 25 gal | 94.6353 L |
| 50 gal | 189.271 L |
| 100 gal | 378.541 L |
| 500 gal | 1,892.71 L |
| 1,000 gal | 3,785.41 L |
To convert US Gallons to Liters, multiply the value by 3.78541. This factor comes from the ratio of the two units' definitions: one US Gallon equals 3.78541 Liters.
For example: 1 US Gallon = 3.78541 Liters, and 10 US Gallons = 37.8541 Liters.
To convert in the reverse direction — from Liters to US Gallons — multiply by 0.264172.
The US liquid gallon is defined as exactly 231 cubic inches, or approximately 3.785 liters. It equals 4 quarts, 8 pints, or 128 fluid ounces. The gallon is the standard large-volume liquid unit in the United States and appears on virtually every fuel pump, milk jug, and water cooler in the country. US fuel economy is typically measured in miles per gallon (mpg), making the gallon central to automobile culture and environmental policy discussions in America.
The gallon traces its origins to English medieval measures, where it was defined differently for wine (the wine gallon, which became the US gallon) and for ale (the ale gallon, larger). The wine gallon's adoption in the American colonies and its eventual standardization as the US gallon explains why the US gallon (3.785 L) is smaller than the imperial gallon (4.546 L) still used in the UK for some purposes. A US gallon of water weighs about 8.34 pounds, and a gallon of gasoline weighs about 6.3 pounds.
The gallon is used in the US for large-scale liquid quantities across many industries: agricultural irrigation (acre-feet can be expressed in millions of gallons), plumbing fixture ratings (gallons per flush, gallons per minute), swimming pool capacities, and paint coverage (square feet per gallon). Outside the US, the liter has completely replaced the gallon for fuel and most liquids, though the imperial gallon persists for some UK fuel contexts and the phrase "miles per gallon" remains in British usage.
The liter (L) is the fundamental practical unit of volume in the metric system, defined as exactly one cubic decimeter (a cube 10 cm on each side). Originally defined in 1795 as the volume of one kilogram of pure water at 4°C — the temperature of maximum water density — the liter was later refined to exactly 0.001 cubic meters. A liter of water weighs almost exactly one kilogram, a relationship that makes mental calculation intuitive across cooking, chemistry, and everyday life.
The liter dominates fluid commerce worldwide: bottled water, milk, juice, cooking oil, and soft drinks are sold in liters across most countries. Fuel economy is measured in liters per 100 kilometers throughout Europe and much of Asia. Engine displacement — the total swept volume of all cylinders — is measured in liters (or sometimes cubic centimeters for smaller engines): a "2.0 L engine" is a familiar car specification.
In chemistry, the liter is the standard for solution concentrations: molarity (moles per liter), normality, and mass concentrations all use the liter as the reference volume. The abbreviation "L" (uppercase, to avoid confusion with the numeral 1) is preferred in most modern usage, though "l" (lowercase) remains in some older texts. One liter equals 1,000 milliliters, 100 centiliters, or approximately 1.057 US liquid quarts.
1 US Gallon equals 3.78541 Liters.
To convert US Gallons to Liters, multiply by 3.78541. For example, 1 US Gallon = 3.78541 Liters.
1 Liter equals 0.264172 US Gallons.