Gallon

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A gallon is a volumetric unit of measurement. People have used many different gallons throughout history. There is only one type of gallon still commonly used.

1 imperial gallon = 4.54609 litres (exactly) **No longer used in the United Kingdom.**
= 8 imperial pints
≈ 1.20 U.S. wet gallons
≈ 1.03 U.S. dry gallons
= 10 pounds of pure water at 17° Celsius
1 U.S. wet gallon = 231 cubic inches = 3 in × 7 in × 11 in **This is the gallon commonly used in the US.**
= 128 U.S. fl. oz.
= 8 U.S. wet pints
= ​142 of a U.S. oil barrel
= 3.785411784 litres (exactly)
≈ 0.83 imperial gallons
≈ 0.86 U.S. dry gallons
≈ 8.33 pounds of pure water at room temperature
1 U.S. dry gallon = 268.8025 cubic inches **Occasionally used in the US.**
= 8 U.S. dry pints
= ​18 of a U.S. bushel
= 4.40488377086 litres (exactly)
≈ 0.97 imperial gallons
≈ 1.16 U.S. wet gallons