Gallons to Liters (gal to L)
A US gallon is exactly 3.785411784 liters. The UK (imperial) gallon is larger at 4.54609 liters — about 20% more — so check which gallon you have.
Liters
3.78541
Formula
liters = US gallons × 3.785411784
Example: 5 US gallons = 18.9271 liters.
Gallons to Liters chart
| US gallons | liters |
|---|---|
| 0.5 | 1.89271 |
| 1 | 3.78541 |
| 2 | 7.57082 |
| 5 | 18.9271 |
| 10 | 37.8541 |
| 12 | 45.4249 |
| 15 | 56.7812 |
| 20 | 75.7082 |
| 25 | 94.6353 |
| 30 | 113.562 |
| 40 | 151.416 |
| 50 | 189.271 |
| 55 | 208.198 |
| 75 | 283.906 |
| 100 | 378.541 |
Good to know
Fuel economy and tank sizes are where the two gallons get mixed up: a 15-gallon US tank holds 56.8 L; a 15-gallon UK tank would hold 68.2 L. Miles per gallon figures differ for the same reason.
Aquariums: a 20-gallon tank is 75.7 L and a 55-gallon tank is 208 L of gross volume, before gravel and decor.
Frequently asked questions
How many liters in a gallon?
3.785 L in a US gallon; 4.546 L in a UK (imperial) gallon.
How many liters is 5 gallons?
5 US gallons is 18.93 L.
Is a UK gallon bigger than a US gallon?
Yes, by about 20%: 4.546 L vs 3.785 L.