Enter a value in one of the fields to convert kilometers to millimeters:
To calculate the length in millimeters you multiply the length in kilometers by 1,000,000.0:
The kilometer is an international unit of length for measuring large distances. It equals exactly 1,000 meters.
The millimeter is an international unit for measuring very small lengths. It equals 0.001 meters and 0.1 centimeters.
| Kilometers | Millimeters | |
|---|---|---|
| Marathon | 42.2 | 42,195,000.0 |
| Race track "Mille Miglia" | 1,609.3 | 1,609,300,000.0 |
| Earth radius | 6,378.2 | 6,378,165,000.0 |
| Earth circumference | 40,075.2 | 40,075,192,000.0 |
| Distance earth ↔ moon | 384,400.0 | 384,400,000,000.0 |
| Distance earth ↔ sun | 149,593,780.0 | 149,593,780,000,000.0 |