A kilometer is a unit of length equal to 1,000 meters and is a bit more than half a mile. In everyday terms, it is commonly used to measure distances between places, such as how far apart towns or points on a road are.

Basic size

  • 1 kilometer = 1,000 meters.
  • 1 kilometer is also equal to 100,000 centimeters.
  • 1 kilometer is approximately 0.621 miles, so a kilometer is a little over half a mile.

How it feels in real life

  • A 1 km walk at a normal pace usually takes about 10–15 minutes for most people, depending on speed.
  • Many running events use kilometers, such as a 5K race, which is 5 kilometers or 5,000 meters.

Quick comparisons

  • A kilometer is much longer than a standard athletics track, which is 400 meters, so 1 km is two and a half laps of such a track.
  • If you think in miles, 10 km is about 6.2 miles, which is a common “10K” race distance.

TL;DR: A kilometer is a long-distance unit equal to 1,000 meters, 100,000 centimeters, or about 0.62 miles, often used for road and running distances.