Gallons to Liters Converter

Instantly calculate! Your online conversion tool always at hand to easily convert gallons to liters. Perfect for cooking, fuel economy, aquariums, and international unit conversion. Simply enter your value and get accurate results immediately.

How to Convert Gallons to Liters

liters = gallons × 3.78541

1 gallon = 3.7854 L
1 liter = 0.2642 gallons

Example: convert 5 gallons to liters:
5 gal = 5 × 3.78541 = 18.927 L

Gallons to Liters

Value:

Convert to:

From gallons to liters

3.7854

1 gal = 3.7854 L

Quick Conversion Table

Gallons	Liters
1	3.7854
2	7.5708
3	11.3562
5	18.927

Gallons	Liters
10	37.854
15	56.781
20	75.708
25	94.635

Gallons	Liters
50	189.271
100	378.541

About the Units

US Gallon (gal)

The US gallon is a unit of volume equal to 128 US fluid ounces, or about 3.785 liters. It is commonly used in the United States for measuring fuel, beverages, and other liquids. The US gallon is smaller than the Imperial (UK) gallon, which equals approximately 4.546 liters. The gallon has its origins in medieval England but was standardized differently in the US and UK systems.

Liter (L)

The liter (or litre) is a metric unit of volume equal to 1,000 milliliters or 1 cubic decimeter. It is the standard unit for measuring liquid volumes in most countries worldwide. Originally defined in 1795 as the volume of one kilogram of water at 4 degrees Celsius, it is used extensively in science, commerce, cooking, and everyday life across the globe.

Frequently Asked Questions

How many liters in a gallon?

One US gallon equals approximately 3.7854 liters (exactly 3.785411784 liters).

How to convert gallons to liters?

To convert gallons to liters, multiply the gallon value by 3.78541. For example, 5 gallons = 5 × 3.78541 = 18.927 liters.

What is 1 gallon in liters?

1 US gallon equals 3.7854 liters.

How many gallons in a liter?

1 liter equals approximately 0.2642 US gallons.

What is 5 gallons in liters?

5 US gallons equals approximately 18.927 liters (5 × 3.78541).

What is 10 gallons in liters?

10 US gallons equals approximately 37.854 liters (10 × 3.78541).

Difference between US and Imperial gallon?

A US gallon equals 3.785 liters, while an Imperial (UK) gallon equals 4.546 liters. The Imperial gallon is about 20% larger than the US gallon.

How many liters is a half gallon?

A half gallon (0.5 US gallons) equals approximately 1.893 liters.

Is 1 gallon more than 3 liters?

Yes, 1 US gallon (3.785 liters) is more than 3 liters by about 0.785 liters.

Quick way to estimate gallons to liters?

A quick mental math trick: multiply gallons by 4, then subtract about 5%. For example, 10 gallons × 4 = 40, minus 5% (2) = 38 liters (actual: 37.854 L).