Imperial Gallons to Cubic Centimeters (gal (UK) to cm³)

1 imperial gallon equals 4,546.09 cubic centimeters exactly.

1 imperial gallon = 4,546.09 cubic centimeters

How to convert imperial gallons to cubic centimeters

To convert imperial gallons to cubic centimeters, multiply the number of imperial gallons by 4,546.09. This factor is exact. To go the other way, multiply cubic centimeters by 0.0002199692483 (rounded).

cubic centimeters = imperial gallons × 4,546.09

Example: 10 imperial gallons = 45,460.9 cubic centimeters.

Pints, quarts, gallons and fluid ounces differ between the US and the UK. Units are labeled 'US' or 'imperial' to avoid confusion.

About these units

Imperial Gallon (gal (UK))

Imperial (British)Current unit

Exactly 4.54609 liters, the volume of 10 pounds of water. Used for fuel economy in the UK (miles per gallon) and historically across the Commonwealth.

Britain unified its confusing gallons by act of Parliament in 1824. Before then, the country used separate ones for wine at 231 cubic inches, ale at 282 and corn at about 268.8. The 1824 reform replaced them with the imperial gallon, defined as the volume of ten pounds of distilled water, calculated at 277.274 cubic inches. A new definition in 1889 slightly changed that, and after the liter was restored to exactly a cubic decimeter in 1964, Canada and then the UK in 1976 adopted the exact value of 4.54609 liters.

Because the United States kept the 231-cubic-inch wine gallon, an imperial gallon is about 20 percent larger than a US gallon. That explains why a car rated at 40 miles per gallon in Britain is less impressive in American terms, since it comes to roughly 33 US miles per gallon. Ireland dropped the gallon as a primary trade unit at the end of 1993 and the UK at the end of September 1995, but it lives on in British fuel-economy figures and older recipes.

1 imperial gallon = 4.54609 liters (exactly).

Sources: Wikipedia: Gallon; UK Weights and Measures Act 1985, Schedule 1

Cubic Centimeter (cm³)

Metric (SI)Current unit

Exactly one milliliter. Used for engine displacement (as 'cc') and in medicine.

Cubic centimeter is the volume of a cube one centimeter on each side, and it belonged to the old centimeter-gram-second system of units, in which one cubic centimeter of water was meant to weigh about one gram. Its famous abbreviation, cc, is not an SI symbol at all. The official symbol is cm³, yet cc stuck in medicine, cooking and engineering because it is quick to write and say.

A cubic centimeter equals exactly one milliliter, so the two names are interchangeable and which one you meet depends on the field. Doses are often written in cc. Motorcyclists, scooter makers and engine builders use it for displacement: the swept volume is the bore area times the stroke times the number of cylinders, so a 1,000 cc sport bike can move eight times as much air per cycle as a 125 cc scooter. One cubic inch is 16.38706 cubic centimeters, which lets Americans and Europeans compare engines.

1 cubic centimeter = 0.001 liters (exactly).

Sources: Wikipedia: Cubic centimetre; Wikipedia: Litre

Related conversions

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