**A kilometer is equal to 1,000 meters or 0.62137 miles.** This is the primary measure of large distances throughout most of the world, though the United States still uses the mile as its standard.

Officially, the definition of a meter is the length of the path travelled by light in a vacuum during a time interval of 1/299,792,458 of a second. Therefore, the official definition of a kilometer is ten times that distance, which happens to be 1,000 meters. For a real world comparison, imagine Central Park in New York City. It is 849 meters wide — just short of a kilometer — and approximately 4 kilometers long.