Gallons to Liters Converter
Convert US gallons to liters instantly. Free online gal to L calculator—multiply by 3.78541. For fuel, cooking, and aquariums.
How to Convert Gallon to Liter
To convert gallons to liters, multiply the number of gallons by 3.78541, as one gallon equals approximately 3.78541 liters.
Conversion Formula:
value * 3.78541Conversion Examples
Example: 1 gallon to liters
- 1 × 3.78541 ≈ 3.785 L
1 US gallon ≈ 3.785 liters
Standard US liquid gallon.
Example: 15 gallons to liters
- 15 × 3.78541 ≈ 56.78 L
15 US gallons ≈ 56.78 liters
Typical fuel tank size context.
Conversion Chart
| Gallon | Liter |
|---|---|
| 1 | 3.785 |
| 2 | 7.571 |
| 3 | 11.356 |
| 4 | 15.142 |
| 5 | 18.927 |
| 6 | 22.712 |
| 7 | 26.498 |
| 8 | 30.283 |
| 9 | 34.069 |
| 10 | 37.854 |
| 15 | 56.781 |
| 20 | 75.708 |
| 30 | 113.562 |
| 60 | 227.125 |
| 100 | 378.541 |
Conversion Formula
The formula to convert gallon to liter is:
gallon × 3.78541 = liter
Mathematically, you can write this as:
gallon × 3.78541 liter/gallon = liter
The gallon units cancel out, leaving you with liter.
Quick Conversion Tip
Quick conversion: Multiply gallon by 3.78541 to get liter. For example, 1 gallon = 3.78541 liter, 2 gallon = 7.57082 liter, 5 gallon = 18.92705 liter.
Unit Definitions
US Gallon (gal)
A US gallon is a common liquid volume unit used in the United States for fuel, beverages, and water.
1 US gallon = 3.78541 liters = 128 US fluid ounces = 16 US cups
Liter (L)
A liter is a metric volume unit equal to one cubic decimeter. It is widely used for beverages, science, and everyday measurements.
1 liter = 0.001 cubic meter ≈ 61.0237 cubic inches ≈ 0.264172 US gallons
Common Use Cases
- Fuel volume when traveling in metric countries.
- Cooking and brewing recipes using liters.
- Aquarium and chemical mixing labels.
- Comparing US product volumes to metric packaging.
Understanding the Conversion
US gallons to liters uses 1 US gal = 3.785411784 L. Do not confuse with the larger imperial (UK) gallon (~4.546 L).
This page is for US liquid gallons—common for gas pumps, milk jugs, and pool chemicals in the United States.
FAQs
How many liters in a US gallon?
About 3.785 liters per US gallon.
Is a UK gallon the same?
No—an imperial gallon is about 4.546 liters.
How do I convert gallons to liters?
Multiply US gallons by 3.78541.