Gallons to Liters Converter
There are exactly 3.78541 liters in one gallon. To convert gallons to liters, multiply by 3.78541.
How to Convert Gallons to Liters
To convert gallons to liters, multiply by 3.78541.
For example: 5 gallons × 3.78541 = 18.9271 liters.
Where This Comes Up
American fuel pumps, paint cans, water heaters and milk jugs are all sized in gallons. Fuel economy comparisons, aquarium specs and imported equipment ratings are in liters.
A 15-gallon fuel tank holds 56.7812 liters, which fills to about 57 at a European pump.
What People Get Wrong
A UK imperial gallon is 4.54609 liters, about 20 percent larger than the US gallon. British fuel economy figures in miles per gallon are therefore not comparable to American ones.
Gallons to Liters Conversion Table
| Gallons (gal) | Liters (L) |
|---|---|
| 1 | 3.78541 |
| 2 | 7.57082 |
| 3 | 11.3562 |
| 4 | 15.1416 |
| 5 | 18.9271 |
| 6 | 22.7125 |
| 7 | 26.4979 |
| 8 | 30.2833 |
| 9 | 34.0687 |
| 10 | 37.8541 |
| 11 | 41.6395 |
| 12 | 45.4249 |
| 13 | 49.2104 |
| 14 | 52.9958 |
| 15 | 56.7812 |
| 16 | 60.5666 |
| 17 | 64.352 |
| 18 | 68.1374 |
| 19 | 71.9228 |
| 20 | 75.7082 |
| 25 | 94.6352946 |
| 30 | 113.562 |
| 40 | 151.416 |
| 50 | 189.271 |
| 75 | 283.906 |
| 100 | 378.541 |
| 250 | 946.352946 |
| 500 | 1,892.71 |
| 1,000 | 3,785.41 |
About These Units
The gallon
A US liquid gallon is exactly 3.785411784 liters, made up of 4 quarts or 128 fluid ounces. The UK imperial gallon is a different unit of 4.546 liters, about 20 percent larger.
The liter
A liter is 1,000 milliliters, defined as exactly one cubic decimeter. Bottled drinks, fuel and engine sizes are measured in liters nearly everywhere outside the United States.
Definitions follow NIST Handbook 44, Appendix C. See how we calculate for the exact values and rounding rules.
Frequently Asked Questions
How many liters is 1 gallon?
One US liquid gallon is exactly 3.785411784 liters.
How many liters is 5 gallons?
5 US gallons is 18.9271 liters, which is why a 20-liter jerry can holds a little more.
Is a UK gallon bigger?
Yes, by about 20 percent. The imperial gallon is 4.54609 liters against the US gallon at 3.785411784 liters.
How do I convert miles per gallon to L/100 km?
Divide 235.215 by the mpg figure. 30 mpg works out to 7.84 liters per 100 kilometers.