US Gallons to Liters Converter

One US Gallon equals 3.785411784 Liters (1 gal = 3.785411784 l). Multiply a US Gallon value by 3.785411784 to get the equivalent in Liters. Enter your value in the calculator above. The formula and examples below show how to calculate it by hand.

Formula

l = gal × 3.785411784

Multiply the US Gallon value by 3.785411784 to get the equivalent value in Liters.

Example Conversions

1 US Gallon (gal)

3.785411784 Liter (l)

5 US Gallon (gal)

18.92705892 Liter (l)

10 US Gallon (gal)

37.85411784 Liter (l)

25 US Gallon (gal)

94.6352946 Liter (l)

100 US Gallon (gal)

378.5411784 Liter (l)

Conversion Table

Common conversion values from US Gallon to Liter
US Gallon (gal)Liter (l)
0.10.3785411784
0.51.892705892
13.785411784
27.570823568
518.92705892
1037.85411784
2594.6352946
50189.2705892
100378.5411784
250946.352946
5001892.705892
10003785.411784

How to Convert Manually

Use these steps to convert US Gallon values to Liter without the calculator.

  1. Write down the value in US Gallon (gal) that you want to convert.
  2. Multiply that value by 3.785411784.
  3. For example, 10 US Gallons × 3.785411784 = 37.85411784 Liters.
  4. Label the result as Liter (l).

Relative Size Comparison

1 US Gallon
1 gal
1 Liter0.2641720524 US Gallons
1 l

This chart shows the visual difference in size between exactly one US Gallon and one Liter.

About US Gallon and Liter

The US gallon is defined as 231 cubic inches, exactly 3.785411784 liters. US fuel prices, milk jugs, and paint cans are all per-gallon quantities. The liter is exactly one cubic decimeter, a cube 10 cm on each side. Beverages, fuel, and engine displacement are sold and specified in liters across the metric world. One US Gallon equals 3.785411784 Liters (1 gal = 3.785411784 l). US Gallon is used in US fuel prices and in US milk and beverage containers. Liter is used in beverage bottles and cartons.

Precision and Rounding:US and imperial volume units share names but differ in size (an imperial gallon is about 20% larger than a US gallon), so confirm which system a figure uses before converting. Kitchen work tolerates rounding to the nearest milliliter or quarter-teaspoon; fuel, chemistry, and brewing need three or more decimal places.

Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).

Worked Example

15US Gallons equals56.78117676Liters.

15 gal × 3.785411784 = 56.78117676 l

FAQ

How do I convert US Gallon to Liter?

Multiply the US Gallon value by 3.785411784 to get the equivalent value in Liters.

What is the formula for US Gallon to Liter?

The formula is l = gal × 3.785411784.

How many Liters are in 1 US Gallon?

1 US Gallon equals 3.785411784 Liters.

Can I convert Liter back to US Gallon?

Yes. 1 Liter equals 0.2641720524 US Gallons, and the related converter can reverse the calculation.

What are common names for US Gallon and Liter?

US Gallon is shown as gal and may also be searched as gallons, us gallons. Liter is shown as l and may also be searched as liters, litre, litres.

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