How to convert gallons to liters
To convert gallons to liters, multiply by 3.785411784. A US gallon is about 3.785 liters, while the UK imperial gallon is about 4.546 liters, so the source of a figure matters.
Gallon to Liter conversion table
| Gallon (gal) | Liter (L) |
|---|---|
| 0.1 gal | 0.3785411784 L |
| 0.5 gal | 1.892705892 L |
| 1 gal | 3.785411784 L |
| 2 gal | 7.570823568 L |
| 3 gal | 11.356235352 L |
| 4 gal | 15.141647136 L |
| 5 gal | 18.92705892 L |
| 10 gal | 37.85411784 L |
| 20 gal | 75.70823568 L |
| 25 gal | 94.6352946 L |
| 50 gal | 189.2705892 L |
| 100 gal | 378.5411784 L |
| 500 gal | 1,892.705892 L |
| 1,000 gal | 3,785.411784 L |
About the units
Gallon (gal)
A US liquid gallon is defined as 231 cubic inches, exactly 3.785411784 liters.
Liter (L)
A liter equals one cubic decimeter (1,000 cm³) and is the common metric unit for drinks and fuel.
How to use this converter
- Type the number of gallons (gal) in the input box.
- The result in liters appears instantly — no button needed.
- See the same value in every other volume unit just below.
- Use “Swap units” to convert liters back to gallons.
When you’ll use the gallon to liter conversion
Your car’s US manual says the tank holds 14 gallons and you are filling up in Canada, where fuel is sold by the liter. Converting gives about 53 liters.
A paint can says it covers 400 sq ft per gallon, but the paint you can buy locally is sold in 4-liter tins. Converting tells you how many tins equal the gallons you need.
💡 For a quick estimate in your head, multiply by about 3.8 (the exact factor is 3.785411784).
Watch out for these mix-ups
- Using the imperial gallon factor for US figures, or the reverse.
- Assuming a gallon is roughly 4 liters for large volumes.
- Mixing gallons per hour with liters per minute without converting time too.
- Comparing fuel prices without converting both price and volume.
Tips for better results
- Check whether a figure is in US or imperial gallons.
- Use 3.785 for US gallons and 4.546 for UK gallons.
- Convert price per gallon to price per liter when comparing fuel costs.
💡 Practical tip: A UK gallon is about 20% bigger than a US gallon, so UK miles-per-gallon figures look higher for the same car.
Frequently asked questions
How many liters are in one gallon?
One gallon equals 3.785411784 liters. 3.785411784 is the exact factor used by this converter.
How do I convert gallons to liters?
Multiply the value in gallons by 3.785411784. To go the other way, multiply liters by 0.264172052358.
What is 10 gal in L?
10 gal = 37.85411784 L. Also, 5 gal = 18.92705892 L and 100 gal = 378.5411784 L.
What is the difference between a gallon and a liter?
A US liquid gallon is defined as 231 cubic inches, exactly 3.785411784 liters. A liter equals one cubic decimeter (1,000 cm³) and is the common metric unit for drinks and fuel.
Is this tool free and private?
Yes — the Gallon to Liter is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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