Gallons to Liters Calculator
Gallons ↔ liters with US or imperial gallons. Click any i for detail.
Volume
Convert
i
Direction
Gallons to liters, or the reverse. |
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|---|---|
Gallon type
i
Type
US fuel and paint are US gallons; some Commonwealth contexts use imperial. |
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Gallons
i
gal
Volume in gallons. |
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Liters
i
L
Volume in liters. |
How to use this calculator
- Pick direction and gallon type.
- Enter the volume.
- Read gallons, liters, quarts, and mL.
Results explained
A US liquid gallon is exactly 3.785411784 L. An imperial gallon is 4.54609 L. Car fuel economy, aquarium fills, and paint coverage all assume a gallon definition — pick the one on your label.
Quick reference: gal ↔ L
US gal = 3.785411784 L; imperial gal = 4.54609 L.
| Item | Detail |
|---|---|
| 1 US gal | 3.785 L |
| 1 imperial gal | 4.546 L |
| 5 US gal | 18.927 L |
| Quarts | 4 US qt per US gal |
Dry gallons are a different, uncommon unit — not used here.
How the estimate is built
L = gal × factor; gal = L / factor (US 3.785411784 or imperial 4.54609).
Example scenario
1 US gallon → 3.785 L.
FAQ
Which gallon does my US car use?
US liquid gallons for fuel economy and pump volume.
Paint cans say gallons — US or imperial?
In the US market, US gallons. Check the liter equivalent printed on the can when unsure.
How do I convert aquariums?
Enter tank gallons (usually US in North America) to get liters for conditioner dosing charts.
Is a liter the same as a quart?
No. 1 US quart ≈ 0.946 L.