Gallons to Liters Converter
Type US gallons to get liters. One US gallon is exactly 3.785411784 liters.
5 gal =
18.9271L
5 US gallons is 18.9271 liters.
- 1 gal
- 3.7854 L
- 1 L
- 0.2642 gal
How to convert gallons to liters
Multiply US gallons by 3.785411784. This number is exact: a US gallon is 231 cubic inches by definition, and with the inch fixed at 2.54 cm, 231 cubic inches is 3,785.411784 cubic centimeters.
Fifteen gallons of fuel is 15 × 3.7854 = 56.78 liters. A 3 gallon water cooler bottle holds 11.36 liters, and a 55-gallon drum, filled to the brim, holds 208.2 liters.
For imperial gallons multiply by 4.54609 instead. A 5 gallon bucket in Britain, if it really is 5 imperial gallons, holds 22.7 liters, while a US 5 gallon bucket holds 18.9 liters.
liters = US gallons × 3.785411784
- One US gallon is 231 cubic inches, which NIST gives as exactly 3.785411784 liters. Source: NIST, SI units: volume.
- One imperial gallon is 4.54609 liters, about 20% more than a US gallon. Source: UK Weights and Measures Act 1985, Schedule 1.
How to estimate gallons to liters in your head
Multiply by 4, then take away 5%. Four liters per gallon is slightly generous, so trim it: 15 × 4 = 60, minus 3 is 57, against the exact 56.78. For a quick figure at the pump, “four liters a gallon, minus a bit” is close enough.
For imperial gallons, multiply by 4.5: 10 imperial gallons is about 45 liters (45.46 exactly).
Gallons to liters chart
US gallons in liters, and what the same number of imperial gallons would be.
| Gallons | Liters (US gallon) | Liters (UK gallon) |
|---|---|---|
| 0.25 | 0.9464 | 1.1365 |
| 0.5 | 1.8927 | 2.273 |
| 1 | 3.7854 | 4.5461 |
| 2 | 7.5708 | 9.0922 |
| 2.5 | 9.4635 | 11.3652 |
| 3 | 11.3562 | 13.6383 |
| 4 | 15.1416 | 18.1844 |
| 5 | 18.9271 | 22.7305 |
| 6.5 | 24.6052 | 29.5496 |
| 8 | 30.2833 | 36.3687 |
Show all 20 rowsShow fewer
| 10 | 37.8541 | 45.4609 |
| 12 | 45.4249 | 54.5531 |
| 15 | 56.7812 | 68.1913 |
| 18 | 68.1374 | 81.8296 |
| 20 | 75.7082 | 90.9218 |
| 25 | 94.6353 | 113.652 |
| 30 | 113.562 | 136.3827 |
| 40 | 151.416 | 181.8436 |
| 55 | 208.198 | 250.035 |
| 100 | 378.541 | 454.609 |
Frequently Asked Questions
How many liters are in a gallon?
A US gallon is 3.785 liters and an imperial (UK) gallon is 4.546 liters. If a source does not say which, US labels and recipes mean the US gallon.
How many liters is a half gallon of milk?
A US half gallon is 1.893 liters, just under 2 liters. A quart, a quarter of a gallon, is 0.946 liters.
How many liters does a 5 gallon bucket hold?
Five US gallons is 18.93 liters. If the bucket is sold by imperial gallons, 5 of them is 22.73 liters, so check the country of the label.
How many liters is a cubic foot of water?
A cubic foot is 28.32 liters, which is 7.48 US gallons. That is handy for sizing a tub, a pond or a fridge listed in cubic feet.