Which countries still use gallons?

The United States primarily uses the US gallon. The UK, Canada, and several Caribbean and Latin American countries still use the Imperial or US gallon in specific contexts, though most have officially transitioned to the metric system (liters) for everyday trade.

Volume Conversion Tool

Gallon to Liter Calculator - Convert US Gallon to Litre & Gal to L

If you're wondering how many liters in a gallon, use our gallon to liter calculator to get instant answers. Whether you need to convert 2 gallons to l, check us gallon to litre conversions, or learn the difference between gallon dry vs liquid, this tool handles all gal ltr calculations effortlessly.

Converted Value

3.785 L

Input

1 Gallon

Volume Input & Units

Enter Quantity Number or decimal

From

Decimals

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Converted Metric Volume

3.785 L

1 US Liquid Gallon = 3.78541 Liters (3,785.41 mL)

Quarts (US)

4.000 qt

Fluid Ounces (fl oz)

128.000 fl oz

Milliliters (mL)

3,785.412 mL

Back to Source

1.000 gal

Formula Applied: L = gal × 3.785411784

Popular Gallon to Liter Conversions (US Liquid)

Quick reference values for high-frequency conversion queries.

Search Query	Conversion Result
how many litres in half a gallon / half gallon to liter	1.892 liters
1 gal to 1 liter / 1 gallon in l	3.785 liters
2 gallons to l / 2 gallons to liters / 2 gal to liter	7.571 liters
2.6 gallon in liters	9.842 liters
9 gal to liters	34.068 liters
10 us gallons to litres	37.854 liters
12 gallon to liter / convert 12 gallons to liters	45.424 liters
13 gallons to litres	49.210 liters
21 gallon to liter	79.493 liters
22 gallons in litres	83.279 liters
130 gallons to liters	492.103 liters
200 gallon to liter / 200 gallon in litres	757.082 liters
250 gal to liters	946.353 liters
2500 gallons to liters	9,463.53 liters
12000 gal to liter / 12000 gallons to liters	45,424.94 liters
20000 gallons to litres	75,708.24 liters

Gallon to Liter Conversion Chart (1–100)

Dynamic printable conversion chart for chosen units.

Input Quantity	Converted Result	Conversion Pair

The Ultimate Guide to Gallon and Liter Conversions

Whether you are tracking the fuel efficiency of your car on an international road trip, maintaining the delicate chemical balance of a large aquarium, or following an old family recipe passed down from overseas, measuring liquids correctly is incredibly important. However, the world is divided: the United States clings to the traditional gallon, while the vast majority of the globe relies on the metric system's liter.

Why Are There Different Types of Gallons?

One of the biggest mistakes people make when converting volume is assuming that all gallons are identical. There are two primary standards:

The US Liquid Gallon (3.785 Liters): The standard unit used across the United States. Originally based on the old British wine gallon (231 cubic inches).
The UK Imperial Gallon (4.546 Liters): Created in 1824 in Great Britain, defined as the volume of 10 pounds of water at 62°F, making it roughly 20% larger than the US liquid gallon.

The Gallon to Liter Formula

To convert US liquid gallons to liters manually, multiply the number of gallons by 3.78541:


            Liters = US Gallons × 3.785411784

            Liters = Imperial Gallons × 4.54609

Frequently Asked Questions About Volume Conversion

Direct answers to common volume measurement questions.

How many liters in a gallon? (How much is a gallon in litres?)

One US liquid gallon is exactly 3.78541 liters, and one UK imperial gallon is exactly 4.54609 liters. Because these two standards are different, you must select the correct gallon type before converting fuel, recipes, or chemicals.

Is 4 liters the same as a gallon to liter?

Not quite. Four liters is slightly more than one US gallon (which is 3.785 L) but less than one UK imperial gallon (4.546 L). While 4 liters is a common rough estimate for 1 gallon in l, you should use exact conversions for recipes or critical measurements.

What is the difference between a US gallon and an Imperial gallon?

The imperial (UK) gallon is approximately 20% larger than the US liquid gallon. 1 Imperial gallon equals 4.546 liters, while 1 US gallon equals 3.785 liters.

Why do the US and UK use different gallons?

The US adopted the old British wine gallon (231 cubic inches) in 1832. In 1824, the UK redefined their system to the imperial gallon (based on 10 pounds of water). The two regions simply kept their different historical standards.

How do you manually calculate gallons to liters?

To convert US liquid gallons to liters, multiply the number of gallons by 3.785. To convert Imperial gallons to liters, multiply by 4.546. Formula: Liters = Gallons × Conversion Factor.

What is the difference between liter and litre?

There is no difference in volume. "Liter" is the American English spelling, while "litre" is the standard spelling in British English and the rest of the world. Both equal 1,000 cubic centimeters.

How many litres in half a gallon?

A half US gallon is approximately 1.89 liters. A half UK imperial gallon is approximately 2.27 liters.