Kilometre vs. Kilometer — What's the Difference?

The kilometre (SI symbol: km; or ), spelled kilometer in American English, is a unit of length in the metric system, equal to one thousand metres (kilo- being the SI prefix for 1000). It is now the measurement unit used for expressing distances between geographical places on land in most of the world; notable exceptions are the United States and the United Kingdom where the statute mile is the unit used.

A metric unit of length equal to 1,000 meters (0.62 mile). See Table at measurement.

A metric unit of length equal to 1000 meters (or 0.621371 miles)

Alternative spelling of kilometre

A measure of length, being a thousand meters. It is equal to 3,280.84 feet, or 0.62137119 of a mile.

A metric unit of length equal to 1000 meters (or 0.621371 miles)