What is the Gallons to Liters Converter?
This converter changes gallons into liters and back again. Type a value, pick the direction and the answer appears instantly, using the exact conversion factor.
How to use the Gallons to Liters tool
- Enter Value and Direction.
- The result updates instantly as you type, or press Calculate.
- Use Try an example to see how it works, and Reset to start again.
Formula
1 gallons = 3.785411784 liters. To convert gallons to liters, multiply by 3.785411784. To go back, divide by 3.785411784. Quick reference: 1 gallons = 3.7854 liters; 5 gallons = 18.9271 liters; 10 gallons = 37.8541 liters; 25 gallons = 94.6353 liters; 50 gallons = 189.2706 liters; 100 gallons = 378.5412 liters.
Worked example
With value 5, direction Gallons to Liters, the liters comes to 18.927059. Conversion factor: 1 gallons = 3.785411784 liters.
Frequently asked questions
How many liters are in one gallon?
One gallon equals 3.785411784 liters.
How do I convert liters back to gallons?
Divide the value by 3.785411784, or switch the direction in the tool above.
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Checked by Calcovate · Formula tested against worked examples · Updated 10 Nov 2026 · How we check our calculators.