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Gallons to Liters Calculator

Convert U.S. liquid gallons to liters for fuel, liquid ingredients, aquariums, containers, and product volumes.

Enter your numbers

Results update as you type. Use Copy link to keep the current inputs in the URL.

gal

Enter the volume measured in U.S. liquid gallons.

Result

Liters
3.7854

U.S. liquid gallons multiplied by 3.785411784.

How gallons to liters conversion works

This calculator uses the U.S. liquid gallon, where one gallon equals 3.785411784 liters.

Gallons are common for fuel, containers, and U.S. liquid volumes. Liters are the standard metric volume unit for many international contexts.

Imperial gallons are different from U.S. liquid gallons. Use the right gallon type before relying on the result.

Useful next steps

Gallons to liters formula

Liters = Gallons * 3.785411784

Multiply U.S. liquid gallons by 3.785411784 to convert to liters.

  • Gallons is the starting U.S. liquid volume.
  • 3.785411784 is the number of liters in one U.S. liquid gallon.
  • Liters is the converted metric volume.

What the Numbers Mean

U.S. liquid gallon
The gallon used for most U.S. liquid volume measurements.
Liter
A metric volume unit equal to one cubic decimeter.
Gallon type
U.S. liquid gallons and imperial gallons are not the same size.

Assumptions

  • The calculator assumes U.S. liquid gallons, not imperial gallons.
  • Negative volumes are not allowed for normal container, fuel, or liquid measurements.
  • Rounded values are suitable for quick estimates; exact dosing or regulated measurement may need stricter precision.
  • Use liters to gallons when the starting value is already metric.

Worked Examples

1 gallon to liters

Input
1 U.S. gallon
Formula
1 * 3.785411784
Output
3.7854 liters

One U.S. liquid gallon is about 3.79 liters.

5 gallons to liters

Input
5 U.S. gallons
Formula
5 * 3.785411784
Output
18.9271 liters

A 5-gallon container holds about 18.93 liters.

10 gallons to liters

Input
10 U.S. gallons
Formula
10 * 3.785411784
Output
37.8541 liters

Fuel and aquarium volumes often use this scale.

15.5 gallons to liters

Input
15.5 U.S. gallons
Formula
15.5 * 3.785411784
Output
58.6739 liters

Decimal gallon values convert with the same factor.

Frequently Asked Questions

How do I convert gallons to liters?

Multiply U.S. liquid gallons by 3.785411784. For example, 2 gallons equals about 7.57 liters.

Does this use U.S. gallons or imperial gallons?

This calculator uses U.S. liquid gallons. Imperial gallons are larger and require a different factor.

How many liters are in 5 gallons?

5 U.S. liquid gallons equals about 18.93 liters.

Can I use this for fuel?

Yes, if the fuel volume is measured in U.S. liquid gallons.

Should I round liters from gallons?

Round for general estimates, but keep more precision for dosing, recipes, or regulated measurements.

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Disclaimer

This calculator uses U.S. liquid gallons and does not replace regulated volume measurement standards.