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Gallons To Liters Converter

Convert US gallons to liters instantly. Perfect for fuel, cooking, and liquid volume conversions to metric.

What this tool does

Convert US gallons to liters instantly. Perfect for fuel, cooking, and liquid volume conversions to metric. Type an amount in US liquid gallons, choose the units, and the tool converts it to liters. It offers 7 volume units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: US liquid gallon, Imperial gallon, Liter, Milliliter, Cubic centimeter, US liquid quart, Imperial quart. Starts as US liquid gallon.
  • To: Choose one of the same 7 units as "From". Starts as Liter.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from US liquid gallons to liters:

  • 1 gal (US) = 3.785411784 L
  • 5 gal (US) = 18.92705892 L
  • 10 gal (US) = 37.85411784 L
  • 50 gal (US) = 189.2705892 L
  • 100 gal (US) = 378.5411784 L

Multiply the number of US liquid gallons by 3.785411784 to get liters. Both units are exact definitions, so 3.785411784 is the exact factor: 1 gal (US) = 3.785411784 L.

Sources: US liquid gallon: NIST Handbook 44, Appendix C. Liter: SI Brochure, 9th edition (2019), Table 8.

Limitations

  • Converts the unit of a volume only. It does not work out a volume from dimensions or weight.
  • Sizes of cups, spoons, gallons and barrels differ between countries. Check that the unit chosen matches your recipe or source.

FAQs

Q: How many liters are in one US liquid gallon?
A: One US liquid gallon is about 3.7854 liters. Enter any amount to convert it.
Q: Which units does this use?
A: It shows both the US gallon (about 3.7854 liters) and the larger imperial (UK) gallon (exactly 4.54609 liters), each with its own quart. US is the default.
Q: Can I convert the other way?
A: Yes. Swap the From and To boxes to convert liters to US liquid gallons.

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