1 gallon (us) = 3.7854118 L
1 gal = 3.78541 L · type math like (12*4)+6.5
Gallons to liters lets the rest of the world interpret American fuel, paint, water and recipe quantities. Expats filling up abroad, homebrewers using US recipes and engineers reading American spec sheets all depend on it.
Fuel economy also depends on this conversion. A car rated at 30 mpg in the US uses 7.84 liters per 100 km. Many European countries display L/100 km instead of mpg, so converting helps travellers compare vehicles.
Fish tanks, paint, and water storage are all sold by the gallon in the US. A 55 gallon drum holds 208 L, a 1 gallon paint can holds 3.79 L, and a 50 gallon water heater holds 189 L. A 20 gallon aquarium holds 75.7 L of water, weighing about 75.7 kg.
Gas prices often need converting too. Fuel at $3.50 per US gallon costs $0.92 per liter, which helps compare with European prices quoted per liter.
Swimming pools in the US are described in gallons. A typical residential pool holds 15,000 to 20,000 gallons, which is 56,800 to 75,700 L. Chemical dosing instructions from European brands use liters, so converting is essential.
Car washes and garden hoses also use gallons. A typical garden hose flows at about 10 gallons per minute, which is 37.9 L/min. Filling a 300 gallon hot tub therefore takes about 30 minutes and uses 1,136 L.
Rain barrels in the US are commonly 55 gallons, which is 208 L, matching the standard industrial drum size.
To check, the liter figure should be a little under four times the gallon figure. 10 gallons should be close to 38 L (37.85 exactly). If your answer is about 45 L, you used the imperial gallon of 4.546 L, which only applies to British and some Canadian figures. If your answer is smaller than the gallon number, you divided instead of multiplying. For fuel and water, one decimal place is plenty of precision.
L = gal × 3.785411784
Reverse: 1 L = 0.26417205 gal.
Convert a 15 gallon water heater to liters.
Answer: 15 gal = 56.8 L.
| gal | L |
|---|---|
| ¼ gal | 0.94635295 L |
| ½ gal | 1.8927059 L |
| ¾ gal | 2.8390588 L |
| 1 gal | 3.7854118 L |
| 2 gal | 7.5708236 L |
| 3 gal | 11.356235 L |
| 4 gal | 15.141647 L |
| 5 gal | 18.927059 L |
| 6 gal | 22.712471 L |
| 7 gal | 26.497882 L |
| 8 gal | 30.283294 L |
| 9 gal | 34.068706 L |
| 10 gal | 37.854118 L |
| 11 gal | 41.63953 L |
| 12 gal | 45.424941 L |
| 13 gal | 49.210353 L |
| gal | L |
|---|---|
| 14 gal | 52.995765 L |
| 15 gal | 56.781177 L |
| 16 gal | 60.566589 L |
| 17 gal | 64.352 L |
| 18 gal | 68.137412 L |
| 19 gal | 71.922824 L |
| 20 gal | 75.708236 L |
| 25 gal | 94.635295 L |
| 30 gal | 113.56235 L |
| 40 gal | 151.41647 L |
| 50 gal | 189.27059 L |
| 75 gal | 283.90588 L |
| 100 gal | 378.54118 L |
| 250 gal | 946.35295 L |
| 500 gal | 1 892.7059 L |
| 1 000 gal | 3 785.4118 L |
A 26 gallon truck tank holds 98.4 L.
A US gallon of milk is 3.785 L, roughly four 1 L cartons.
A standard 5 gallon batch is 18.93 L, which is why European kits are sold as 19 L or 20 L.
Multiplying by 4.546 gives imperial figures. For a US recipe, 5 gallons is 18.9 L, not 22.7 L.
The rare US dry gallon is 4.405 L. Liquid products use the 3.785 L gallon.
Using 4 L per gallon overstates by 5.7%, adding 1 L on a 5 gallon batch.
The US liquid gallon is exactly 231 cubic inches, which equals 3.785411784 liters. It contains 4 quarts, 8 pints or 128 US fluid ounces.
Origin. Based on the old English wine gallon; the US retained it, while the UK adopted the imperial gallon in 1824.
Used today. US fuel, milk jugs, paint cans and water usage.
A liter is one cubic decimeter, a cube 10 cm on each side, exactly 0.001 m³. It is accepted for use with the SI.
Origin. Defined in revolutionary France in 1795.
Used today. Fuel and drink volumes worldwide.
18.93 L.
4.546 L, defined in 1824 as the volume of 10 lb of water.
It descends from the Queen Anne wine gallon of 1707.
A US liquid quart is 0.946 L, one quarter of a gallon.