Gallons to Liters Converter

Convert US gallons to liters instantly and accurately

1 gallon = 3.78541 liters

Conversion Formula

Liters = Gallons × 3.78541

1 US Gallon = 3.78541 Liters

Gallons Liters Gallons Liters
0.250.946518.927
0.51.8931037.854
13.7851556.781
1.55.6782075.708
27.5712594.635
2.59.46450189.271
311.356100378.541

Understanding Gallons to Liters Conversion

What is a Gallon?

A US gallon is a unit of volume measurement in the American customary system. It equals exactly 3.78541 liters or 231 cubic inches. The gallon is commonly used in the United States for measuring fuel, milk, and other liquid commodities.

What is a Liter?

A liter (L) is the standard unit of volume in the metric system, equal to 1,000 cubic centimeters or 1,000 milliliters. It's used worldwide for measuring liquids and is the standard in most countries except the United States.

Conversion Formula and Method

To convert gallons to liters, multiply the number of gallons by 3.78541. This conversion factor is exact and is based on the official definition of the US gallon in terms of cubic inches and the meter.

Common Conversion Examples

Practical Applications

Tips for Quick Mental Conversion

Difference Between US and Imperial Gallons

It's important to note that this converter uses US gallons. The Imperial gallon (used in the UK) is larger:

Frequently Asked Questions

How many liters are in a gallon? +
There are exactly 3.78541 liters in 1 US gallon. For quick estimates, you can use 3.8 liters per gallon.
What's the difference between US and Imperial gallons? +
A US gallon equals 3.78541 liters, while an Imperial gallon equals 4.54609 liters. This converter uses US gallons, which are smaller than Imperial gallons.
How do I convert 5 gallons to liters? +
To convert 5 gallons to liters: 5 × 3.78541 = 18.9271 liters, or approximately 18.9 liters.
Is this conversion accurate for fuel calculations? +
Yes, this conversion is accurate for fuel and all liquid volume calculations. The factor 3.78541 is the official conversion used by automotive and fuel industries.
Why don't we just use round numbers for conversion? +
The conversion factor 3.78541 comes from the exact definitions of both units. Using round numbers like 3.8 or 4 would introduce errors in precise calculations.