How Many Liters in a Gallon?
3.785 L
There are 3.785 liters in 1 US gallon (3,785 ml).
UK: 1 imperial gallon (4,546 ml) = 4.546 L
Exact: 1 gal = 3.785411784 L
Gallons to Liters conversion chart
| Gallons | Liters |
|---|---|
| 0.125 gal | 0.4732 |
| 0.25 gal | 0.9464 |
| 0.5 gal | 1.893 |
| 0.75 gal | 2.839 |
| 1 gal | 3.785 |
| 1.5 gal | 5.678 |
| 2 gal | 7.571 |
| 2.5 gal | 9.464 |
| 3 gal | 11.36 |
| 4 gal | 15.14 |
| 5 gal | 18.93 |
| 6 gal | 22.71 |
| 7 gal | 26.5 |
| 8 gal | 30.28 |
| 10 gal | 37.85 |
| 12 gal | 45.42 |
| 15 gal | 56.78 |
| 20 gal | 75.71 |
| 25 gal | 94.64 |
| 50 gal | 189.3 |
| 55 gal | 208.2 |
| 100 gal | 378.5 |
How to convert gallons to liters
liters = gallons × 3.78541
Example: 2 gal × 3.78541 = 7.571 L.
Multiply US gallons by 3.785 to get liters (litres). For a quick estimate, multiply by four and knock a little off, since a gallon falls just short of 4 liters.
Three gallons, for example, come to 11.36 L, and a quarter gallon, which is one quart, is 0.9464 L.
Round the answer to one decimal place for everyday use. Keep all the digits when you convert back, or the numbers will drift. For the reverse trip, the liters to gallons converter divides by the same factor.
US vs UK gallons
The gallon used in Britain is the imperial gallon, defined as exactly 4.54609 liters. It holds 1.201 gallons in US measure, so the same count of gallons means more liquid on the British side.
If a gallon figure comes from a British source, multiply by 4.546 instead. Six imperial gallons are 27.28 L, while six US gallons are only 22.71 L.
| Unit | Size | Used in |
|---|---|---|
| US gallon | 3,785 ml | US |
| imperial gallon | 4,546 ml | UK |
Reading tank and bucket sizes in liters
When a bucket, drum or fish tank is rated in gallons but your instructions use liters, convert the label first:
- A bucket marked 5 gal holds 18.93 L.
- An aquarium marked 20 gal holds 75.71 L.
- A drum marked 55 gal holds 208.2 L.
The rated size is the full container. The working volume is lower once you leave space at the top or add gravel and decorations.
Weight adds up quickly as well. Based on USDA data, a liter of water weighs about 1 kg, so the water alone in a full 20 gal tank comes to roughly 76 kg.
Gallons and liters: questions
Is a gallon 4 liters?
No, but it is close. A US gallon is a little under four liters, and 4 L works out to 1.057 gal. The British imperial gallon overshoots four liters instead, at 4.546 L.
How many liters are in 5 gallons?
Five US gallons hold 18.93 L, just under 19 liters. A container labeled 19 L is a close match, holding 5.019 gal. Five imperial gallons come to 22.73 L, so check which gallon a British source means.
How many liters is half a gallon?
Half a US gallon is 1.893 L. It is the same amount as 2 quarts or 8 cups. A 2 L bottle holds a bit more than half a gallon.
How many 1-liter bottles fill a gallon?
It takes 3.8 one-liter bottles to fill a US gallon. In practice that is three full bottles plus most of a fourth. An imperial gallon needs 4.5 bottles, so buy four liters to fill a US gallon jug and five for a British one.
How many liters are in 10 gallons?
Ten US gallons hold 37.85 L, a little under 38 liters. A fish tank or cooler rated at 10 gal holds about that much when full. Ten imperial gallons are larger, at 45.46 L.
Related conversions
Sources: Unit definitions: NIST Handbook 44 · Last reviewed · Report an error
https://howmanyounces.com/gallons-to-liters/