US Gallon to Liter Converter
One US Gallon equals 3.785411784 Liter (1 gal = 3.785411784 l). Multiply a US Gallon value by 3.785411784 to get the equivalent in Liter. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.
Formula
l = gal × 3.785411784
Multiply the US Gallon value by 3.785411784 to get the equivalent value in Liter.
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
| US Gallon (gal) | Liter (l) |
|---|---|
| 0.1 | 0.3785411784 |
| 0.5 | 1.892705892 |
| 1 | 3.785411784 |
| 2 | 7.570823568 |
| 5 | 18.92705892 |
| 10 | 37.85411784 |
| 25 | 94.6352946 |
| 50 | 189.2705892 |
| 100 | 378.5411784 |
| 250 | 946.352946 |
| 500 | 1892.705892 |
| 1000 | 3785.411784 |
How to Convert Manually
Use these steps to convert US Gallon values to Liter without the calculator.
- Write down the value in US Gallon (gal) that you want to convert.
- Multiply that value by 3.785411784.
- For example, 10 US Gallon × 3.785411784 = 37.85411784 Liter.
- Label the result as Liter (l).
Relative Size Comparison
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 Liter (1 gal = 3.785411784 l). US Gallon to Liter conversion comes up most often in US fuel prices and in US milk and beverage containers, typically when figures need restating for 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
15 US Gallon equals 56.78117676 Liter.
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 Liter.
What is the formula for US Gallon to Liter?
The formula is l = gal × 3.785411784.
How many Liter are in 1 US Gallon?
1 US Gallon equals 3.785411784 Liter.
Can I convert Liter back to US Gallon?
Yes. 1 Liter equals 0.2641720524 US Gallon, 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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