Gallons to liters
One US gallon is 3.78541 liters. Type an amount in US gallons to see it in liters.
How to convert US gallons to liters
liters = US gallons × 3.785411784
For example, 5 gal is 18.93 L. The figure is exact. For a UK, or imperial, gallon, multiply by 4.54609 instead. The UK gallon is 20% larger than the US gallon, so it matters which one a figure refers to.
A quick way to do it in your head
For US gallons, multiply by 4 and take off a twentieth.
- 5 gal: 20, less 1 is 19 L. The true answer is 18.93 L.
- 10 gal: 40, less 2 is 38 L. The true answer is 37.85 L.
- 15 gal: 60, less 3 is 57 L. The true answer is 56.78 L.
For UK gallons, multiply by 4.5: 10 UK gallons is about 45 L.
US gallons to liters table
| Gallons | Liters if US gallons | Liters if UK gallons |
|---|---|---|
| 0.5 gal | 1.89 L | 2.27 L |
| 1 gal | 3.79 L | 4.55 L |
| 2 gal | 7.57 L | 9.09 L |
| 3 gal | 11.36 L | 13.64 L |
| 4 gal | 15.14 L | 18.18 L |
| 5 gal | 18.93 L | 22.73 L |
| 6 gal | 22.71 L | 27.28 L |
| 8 gal | 30.28 L | 36.37 L |
| 10 gal | 37.85 L | 45.46 L |
| 12 gal | 45.42 L | 54.55 L |
| 15 gal | 56.78 L | 68.19 L |
| 20 gal | 75.71 L | 90.92 L |
| 25 gal | 94.64 L | 113.65 L |
| 30 gal | 113.56 L | 136.38 L |
| 40 gal | 151.42 L | 181.84 L |
| 50 gal | 189.27 L | 227.3 L |
| 100 gal | 378.54 L | 454.61 L |
| 500 gal | 1892.71 L | 2273.05 L |
| 1000 gal | 3785.41 L | 4546.09 L |
Amounts you are likely to meet
| What | US gallons | Liters |
|---|---|---|
| A jug of milk in the United States | 1 gal | 3.79 L |
| A large bucket | 5 gal | 18.93 L |
| A mid-size car fuel tank | 15 gal | 56.78 L |
| A home aquarium | 20 gal | 75.71 L |
| A standard oil drum | 55 gal | 208.2 L |
Quarts, pints and cups
A gallon is divided into 4 quarts or 8 pints in both systems. The pints themselves differ: a US pint is 16 US fluid ounces and a UK pint is 20 UK fluid ounces.
| Measure | US size in liters | UK size in liters |
|---|---|---|
| Gallon | 3.785 L | 4.546 L |
| Quart, a quarter of a gallon | 0.946 L | 1.137 L |
| Pint, an eighth of a gallon | 0.473 L | 0.568 L |
| Cup | 0.237 L | Not a standard UK measure |
The two gallons have different origins. The US gallon is the old English wine gallon of 231 cubic inches. The United Kingdom replaced its several gallons with a single imperial gallon in 1824, and the United States kept the older one.
To go the other way, use liters to gallons. For other units, see the unit converter.
Questions
How many liters is 1 US gallon?
3.78541 L.
How many liters is 5 gal?
18.93 L.
How many liters is 10 gal?
37.85 L.
How many liters is 20 gal?
75.71 L.
How many liters is a UK gallon?
4.54609 liters.
Which gallon do Canada and Australia use?
Both countries now use liters. Where gallons are still mentioned, in older recipes or fuel economy figures, they are usually imperial gallons, the same as the UK gallon.