Gallons to Liters Calculator
gal
Liters:
Milliliters:
Liters if imperial gallons:
Calculation:
This calculator converts US gallons to liters. Type a volume in gallons and you get the result in liters and in milliliters. A third result shows what the same number would be in liters if it were imperial gallons, the UK unit.
Below you will find the formula, worked examples and a conversion chart for common sizes such as gas tanks, water jugs and drums.
How to use the gallons to liters calculator?
Step 1: Type the volume in US gallons. Decimals can be written with a point or a comma.
Step 2: Click Convert or press Enter.
Step 3: The result in liters appears on the right. Below it you get the milliliters and the liters you would have with imperial gallons.
Step 4: The Calculation box shows the multiplication with your numbers.
Gallons to liters formula
A US liquid gallon is exactly 3.785411784 liters. The value is exact because the gallon is defined as 231 cubic inches and an inch is exactly 2.54 cm. To convert gallons to liters, multiply the gallons by 3.785411784:
| V(L) = V(gal) × 3.785411784 |
For a quick estimate, multiply by 3.8. The imperial gallon, used in the UK, is a different unit: exactly 4.54609 liters.
Gallons to liters examples
Example 1: How many liters is 1 gallon?
V(L) = 1 × 3.785411784 ≈ 3.785 L
A gallon of milk holds 3.785 liters, which is 3785.41 mL.
Example 2: A 5 gallon water jug
V(L) = 5 × 3.785411784 ≈ 18.93 L
Example 3: A 15 gallon gas tank
V(L) = 15 × 3.785411784 ≈ 56.78 L
A car with a 15 gallon tank holds 56.78 liters of fuel.
Example 4: A 55 gallon drum
V(L) = 55 × 3.785411784 ≈ 208.2 L
The standard 55 gallon drum holds about 208.2 liters. If those were imperial gallons, the same number would be 250.03 liters.
Gallons to liters chart
| US gallons (gal) | Liters (L) | Liters if imperial gallons |
|---|---|---|
| 0.25 gal | 0.9464 L | 1.137 L |
| 0.5 gal | 1.893 L | 2.273 L |
| 1 gal | 3.785 L | 4.546 L |
| 2 gal | 7.571 L | 9.092 L |
| 3 gal | 11.36 L | 13.64 L |
| 5 gal | 18.93 L | 22.73 L |
| 10 gal | 37.85 L | 45.46 L |
| 12 gal | 45.42 L | 54.55 L |
| 15 gal | 56.78 L | 68.19 L |
| 20 gal | 75.71 L | 90.92 L |
| 25 gal | 94.64 L | 113.65 L |
| 30 gal | 113.56 L | 136.38 L |
| 40 gal | 151.42 L | 181.84 L |
| 50 gal | 189.27 L | 227.3 L |
| 55 gal | 208.2 L | 250.03 L |
| 100 gal | 378.54 L | 454.61 L |
Frequently asked questions
How many liters are in a gallon?
A US gallon is 3.785 liters. The exact value is 3.785411784 L.
How many liters are in a half gallon?
A half gallon is 1.893 liters, which is 1892.71 mL.
What is the difference between a US gallon and an imperial gallon?
A US gallon is 3.785 liters and an imperial gallon is 4.54609 liters, about 1.2 times bigger. Check which one a figure uses before converting, especially with UK fuel economy or tank sizes.
How many gallons are in a liter?
One liter is 0.2642 US gallons. The liters to gallons calculator converts in that direction.
Learn more
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