how many kilometers are 1 millimeter
There are 1.0E-6 kilometer in a millimeter. 1 Millimeter is equal to 1.0E-6 Kilometer. 1 mm = 1.0E-6 km. Millimeter is one the most commonly used units of length which equals to 1/1000th of a meter. It is a unit of SI applicable for measuring small distances and small length.