Kilometers to Millimeters
Convert kilometers (km) to millimeters (mm). Type in either box; the other updates as you go.
How to convert kilometers to millimeters
To convert kilometers to millimeters, multiply the number of kilometers by 1,000,000.
Example
Convert 5 kilometers to millimeters:
Kilometer to millimeter conversion chart
| Kilometers (km) | Millimeters (mm) |
|---|---|
| 1 km | 1,000,000 mm |
| 2 km | 2,000,000 mm |
| 3 km | 3,000,000 mm |
| 4 km | 4,000,000 mm |
| 5 km | 5,000,000 mm |
| 6 km | 6,000,000 mm |
| 7 km | 7,000,000 mm |
| 8 km | 8,000,000 mm |
| 9 km | 9,000,000 mm |
| 10 km | 10,000,000 mm |
| 12 km | 12,000,000 mm |
| 15 km | 15,000,000 mm |
| 20 km | 20,000,000 mm |
| 25 km | 25,000,000 mm |
| 30 km | 30,000,000 mm |
| 40 km | 40,000,000 mm |
| 50 km | 50,000,000 mm |
| 60 km | 60,000,000 mm |
| 70 km | 70,000,000 mm |
| 75 km | 75,000,000 mm |
| 80 km | 80,000,000 mm |
| 90 km | 90,000,000 mm |
| 100 km | 100,000,000 mm |
| 150 km | 150,000,000 mm |
| 200 km | 200,000,000 mm |
| 250 km | 250,000,000 mm |
| 500 km | 500,000,000 mm |
| 1,000 km | 1,000,000,000 mm |
Going the other way? See the millimeters to kilometers chart.
About the units
Kilometer (km)
A kilometer is 1,000 meters. Road distances and running races outside the US and UK are measured in kilometers.
Millimeter (mm)
A millimeter is one thousandth of a meter. It is the unit on engineering drawings, rainfall gauges and the small marks of a metric ruler.
Frequently asked questions
How many millimeters are in a kilometer?
There are 1,000,000 millimeters in a kilometer.
How many kilometers are in a millimeter?
There are 0.000001 kilometers in a millimeter.
How do you convert kilometers to millimeters?
To convert kilometers to millimeters, multiply the number of kilometers by 1,000,000.
What is 5 kilometers in millimeters?
5 kilometers equals 5,000,000 millimeters.
Convert between metric and imperial units of length and distance, from millimeters to miles. Open the length converter to see a value in every unit at once.