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Italiano1 US gallon = 3.785411784 liters
To convert gallons to liters, multiply US gallons by 3.785411784: liters = US gallons × 3.785411784. Example: a 14-gallon fuel tank holds 14 × 3.785411784 = 53.00 L. The UK (imperial) gallon is bigger, 4.54609 L, so 14 imperial gallons come to 63.65 L.
The converter on this page is already set to "US gallon (US gal)" to "liter (l)". Type an amount and the result updates as you type, to six significant figures (5 US gal = 18.9271 l), while the "Formula:" line shows 1 US gal = 3.785411784 l. For imperial gallons, open the "From" list and pick "UK gallon (UK gal)". The ⇄ "Swap units" button turns it into liters to gallons, and the "In every unit" table gives the same amount in pints, cups, fluid ounces and cubic meters.
Gallons to liters conversion chart
| Gallons | Liters (US gal) | Liters (UK gal) | What it is |
|---|---|---|---|
| 0.5 | 1.89 | 2.27 | Half-gallon carton of milk |
| 1 | 3.79 | 4.55 | Gallon jug of milk |
| 2 | 7.57 | 9.09 | Small gas can for the mower |
| 5 | 18.93 | 22.73 | Water cooler bottle, paint bucket |
| 10 | 37.85 | 45.46 | Starter fish tank |
| 14 | 53.00 | 63.65 | Compact car fuel tank |
| 29 | 109.78 | 131.84 | Standard 29-gallon aquarium |
| 40 | 151.42 | 181.84 | Household water heater |
| 42 | 158.99 | 190.94 | Barrel of crude oil |
| 55 | 208.20 | 250.03 | Steel drum |
| 100 | 378.54 | 454.61 | Rain barrel set |
Where gallons meet liters
Gas prices abroad
Fill up in Canada, Mexico or Europe and the pump shows a price per liter. Going the other way helps compare: gas at $3.50 a gallon works out to $0.925 a liter.
Fuel economy: mpg to L/100 km
The two scales run in opposite directions, so you divide a constant by the figure: L/100 km = 235.2145833 ÷ US mpg. The constant is 100 × 3.785411784 ÷ 1.609344. A car rated at 25 mpg uses 9.41 L/100 km. British car reviews quote imperial mpg, where the constant is 282.4809363: 45 mpg there means 6.28 L/100 km. The converter does not do this one, since it mixes distance and volume.
Aquariums, milk and cans
Fish tanks are sold by gallon size. A 29-gallon tank holds 109.78 L of water before you add gravel and rocks, and that liter figure is what most European filters and heaters list on the box.
Frequently asked questions
How many liters are in a gallon?
3.785411784 L in a US gallon and 4.54609 L in an imperial gallon. Rounded, 3.79 L and 4.55 L.
Does the UK still use gallons?
Fuel is sold by the liter in the UK, but fuel economy is still quoted in miles per imperial gallon. Older recipes and home-brewing guides also use the imperial gallon.
How many liters is 5 gallons?
18.93 L in US gallons, the size of a water cooler bottle, and 22.73 L in imperial gallons.