Kilometers and Millimeters (km and mm) Conversion

To convert between kilometers (km) and millimeters (mm) please use the conversion tool below. Enter a kilometer or a millimeter value into the converter and the result will be displayed.

Enter Kilometer
Enter Millimeter

There are 1000000 (one million) millimeters in a kilometer (1000000 mm in 1 km). To convert from kilometers to millimeters, multiply the kilometer value by 1000000 and to convert from millimeters to kilometers, multiply the millimeter value by 0.000001 (or divide by 1000000).

1 Kilometer = 1 000 000 Millimeters

Kilometer is a metric length unit and equals to 1000 meters. The abbreviation is "km".

Millimeter is a metric length unit and equal to one thousandth of a meter. The abbreviation is "mm".

Create Custom Conversion Table
Click "Create Table". Enter a "Start" value (5, 100 etc). Select an "Increment" value (0.01, 5 etc) and select "Accuracy" to round the result.