Kilometer definition
The prefix kilo means one thousand, so one kilometer equals one thousand meters. In symbols, 1 km = 1,000 m.
Length guide
What is a kilometer?
A kilometer is a metric length unit equal to exactly 1,000 meters. It is commonly used for road distance, travel, mapping, athletics, logistics, and geography.
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Common formulas
Kilometers to meters: multiply by 1,000. Kilometers to miles: multiply by 0.621371192237. Miles to kilometers: multiply by 1.609344.
Related conversions
FAQ
How long is 1 kilometer? It is 1,000 meters, about 0.621 miles, or about 3,280.84 feet.