km to mm
92 unitsConvert Kilometer to Millimeter (km to mm)
1 kilometer = 1000000 millimeters. Convert kilometers to millimeters instantly, with the exact factor, the formula and a reference table of common values.
km to mm conversion table
| km | mm |
|---|---|
| 1 km | 1000000 mm |
| 2 km | 2000000 mm |
| 3 km | 3000000 mm |
| 5 km | 5000000 mm |
| 10 km | 10000000 mm |
| 20 km | 20000000 mm |
| 50 km | 50000000 mm |
| 100 km | 100000000 mm |
| 250 km | 250000000 mm |
| 500 km | 500000000 mm |
| 1000 km | 1000000000 mm |
What is a kilometer?
A kilometer is 1,000 meters. The prefix "kilo" always means one thousand, so the math never changes. Most of the world measures road distances and running races in kilometers, which is why road signs outside the United States and the United Kingdom count down in km.
It takes an average walker about 12 minutes to cover a kilometer, and a car on an open highway crosses one in well under a minute. A 5K race is five kilometers, and a marathon is a little over 42 kilometers.
In writing, the kilometer is usually shortened to "km". One kilometer is 1000 meters, and that ratio is what every figure on this page is built from.