Convert US gallons to liters

1 gal (US)=3.78541L

Use the converter below to change any US gallons value into liters instantly — with formula, conversion table, and real-world examples.

You have

Equals

3.785412

Conversion formula

Forward

liters = US gallons × 3.78541

Reverse

US gallons = liters × 0.2642

Example: 10 gal (US) × 3.78541 = 37.8541 L.

About both units

From

US Gallon

gal (US)

The US gallon equals 3.785411784 litres exactly. It is the standard fuel and liquid volume unit in the United States. A typical American car holds 14–18 US gallons of fuel. US fuel economy is quoted in miles per US gallon (mpg).

Real-world: US car tank ≈ 15 gallons (57 L). 1 US gallon of milk is a common grocery size (3.79 L). US paint often sold by the gallon.

Read full us gallon reference →

Liter

The litre is the metric volume unit most used in everyday life. It equals 1 cubic decimetre (0.001 m³) or 1000 ml exactly. Bottled water, petrol, milk and household chemicals are all sold by the litre throughout Europe, Africa and Asia.

Real-world: A standard European petrol-car fuel tank is 50–60 L. A 2.0 L engine has a 2 litre displacement. A typical home boiler holds 150 L of hot water.

Read full liter reference →

US Gallon to Liter conversion table

Common US gallons to liters values for quick reference.

US Gallon (gal (US))	Liter (L)
1 gal (US)	3.78541 L
2 gal (US)	7.57082 L
5 gal (US)	18.9271 L
10 gal (US)	37.8541 L
20 gal (US)	75.7082 L
50 gal (US)	189.271 L
100 gal (US)	378.541 L
200 gal (US)	757.082 L
500 gal (US)	1,892.71 L
1,000 gal (US)	3,785.41 L

Tips & common mistakes

Quick tips

1 US gallon = 3.785 L = 128 US fluid ounces = 4 quarts.
Converting mpg (US) to L/100 km: 235.215 / mpg = L/100 km.
The US gallon is based on the old English Queen Anne wine gallon (1707).

Avoid these

Using UK gallons on a US fuel-economy figure — 30 mpg (US) = 36 mpg (UK).
Confusing US gallon (3.79 L) with UK gallon (4.55 L) — 20% difference.
Using "gallon" without qualifier in cross-Atlantic commerce.

Frequently asked questions

How many liters in a us gallon?

One us gallon equals 3.78541 liters.

How do I convert US gallons to liters?

Multiply the us gallon value by 3.78541 to get the equivalent in liters.

What is 100 US gallons in liters?

100 US gallons equals 378.541 liters.

Is a us gallon bigger than a liter?

Yes. 1 us gallon equals 3.78541 liters, so one us gallon is larger.

How to convert US gallons to liters without a calculator?

Multiply by 3.79 for a quick estimate; use a calculator for precise results.

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