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2025-11-08T11:09:11Z

Article written and Venn diagram created.

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== Gallon vs. Litre ==
The gallon and the litre are both units of volume used to measure liquids, but they originate from different systems of measurement and differ in their volume and usage.<ref name="ref1" /> The gallon is part of the imperial and US customary systems, while the litre is a unit of the metric system.<ref name="ref2" /><ref name="ref1" /> The litre is the more widely used unit globally.<ref name="ref2" />

There are three main types of gallons in use: the imperial gallon, the US liquid gallon, and the less common US dry gallon.<ref name="ref2" /> The imperial gallon is used in the United Kingdom and some Commonwealth countries and is defined as 4.54609 litres.<ref name="ref2" /><ref name="ref3" /> The US liquid gallon, used in the United States and some other countries, is defined as 3.78541 litres.<ref name="ref2" /> The US dry gallon is equal to 4.40488 litres.<ref name="ref2" />

The litre was first introduced in France in the late 18th century as part of the new metric system.<ref name="ref4" /><ref name="ref2" /> It was initially defined as the volume of one kilogram of pure water at 4 degrees Celsius.<ref name="ref2" /> The gallon has a much longer history, with its origins in early European measurement systems for wine and ale in the 14th century.<ref name="ref2" /><ref name="ref4" /> Over time, different definitions of the gallon developed.<ref name="ref2" /><ref name="ref3" /> The US gallon is based on the "wine gallon" of 231 cubic inches, which was in use in Britain before the imperial system was established in 1824.<ref name="ref3" />

The global adoption of the metric system has made the litre the more common unit of volume for most countries.<ref name="ref5" /> The United States is one of the few countries that still predominantly uses the gallon for everyday liquid measurements, such as gasoline and milk.<ref name="ref2" /> In scientific and technical fields, the litre is the standard unit of volume worldwide.<ref name="ref2" />

=== Comparison Table ===
{| class="wikitable"
|-
! Category !! Gallon !! Litre
|-
| '''System of Measurement''' || Imperial and US customary systems || Metric system<ref name="ref1" />
|-
| '''Primary Usage''' || United States and some other countries || Most countries worldwide<ref name="ref2" /><ref name="ref5" />
|-
| '''US Liquid Gallon Volume''' || 3.78541 litres || Not applicable<ref name="ref2" />
|-
| '''Imperial Gallon Volume''' || 4.54609 litres || Not applicable<ref name="ref2" />
|-
| '''Historical Origin''' || 14th-century England for measuring wine and ale || Late 18th-century France as part of the metric system<ref name="ref2" /><ref name="ref4" />
|-
| '''Subdivisions''' || Quarts, pints, gills, and fluid ounces || Millilitres, centilitres, decilitres
|}

[[File:Venn_diagram_Differences_between_Gallon_versus_Litre_comparison.png|thumb|center|800px|alt=Venn diagram for Differences between Gallon and Litre|Venn diagram comparing Differences between Gallon and Litre]]

=== Variations of the Gallon ===
It is important to distinguish between the different types of gallons, as they are not interchangeable. The imperial gallon is approximately 20% larger than the US liquid gallon. The US dry gallon is different from both the liquid gallons.<ref name="ref2" /> These differences arose because the United States continued to use the older British "wine gallon" after the imperial system was introduced in the United Kingdom in 1824.<ref name="ref3" />

The imperial gallon is divided into 160 imperial fluid ounces, while the US gallon is divided into 128 US fluid ounces. This, combined with the slight difference in the size of the fluid ounce in each system, contributes to the overall difference in volume between the two gallons.<ref name="ref3" />

=== Global Usage ===
The litre is the standard unit of volume in most parts of the world due to the widespread adoption of the metric system.<ref name="ref2" /> It is used for labeling beverages, fuel, and other consumer products in most countries.<ref name="ref2" /> In contrast, the gallon remains the primary unit for fuel and many liquid food products in the United States.<ref name="ref2" /> The United Kingdom has largely transitioned to the litre for most purposes, although the imperial gallon is still used in some contexts.

== References ==
<references>
<ref name="ref1">[https://www.difference.wiki/gallon-vs-litre/ "difference.wiki"]. Retrieved November 08, 2025.</ref>
<ref name="ref2">[https://rizing-japan.com/news-articles/exploring-gallons-and-liters-a-comprehensive-analysis-of-liquid-measurement-systems/ "rizing-japan.com"]. Retrieved November 08, 2025.</ref>
<ref name="ref3">[https://en.wikipedia.org/wiki/Gallon "wikipedia.org"]. Retrieved November 08, 2025.</ref>
<ref name="ref4">[https://www.peterpanplanet.com/liters-vs-gallons "peterpanplanet.com"]. Retrieved November 08, 2025.</ref>
<ref name="ref5">[https://en.wikipedia.org/wiki/Imperial_and_US_customary_measurement_systems "wikipedia.org"]. Retrieved November 08, 2025.</ref>
</references>

[[Category:Comparisons]]

Differences between Gallon and Litre - Revision history

Dwg: Article written and Venn diagram created.