1 millimeter in kilometers

Conversion

1 millimeter is equivalent to 1e-06 kilometers.^[1]

Conversion in the opposite direction

The inverse of the conversion factor is that 1 kilometer is equal to 1000000 times 1 millimeter.

It can also be expressed as: 1 millimeter is equal to $\frac{1}{1000000}$ kilometers.

Approximation

An approximate numerical result would be: one millimeter is about zero kilometers, or alternatively, a kilometer is about one million times one millimeter.

Units involved

This is how the units in this conversion are defined:

Millimeters

The millimetre or millimeter (American spelling) is a unit of length in the metric system, equal to one thousandth of a metre, which is the SI base unit of length.

Wikipedia page of millimeters

Kilometers

The kilometre or kilometer (American spelling) is a unit of length in the metric system, equal to one thousand metres (kilo being the SI prefix for 1000). It is now the measurement unit used officially for expressing distances between geographical places on land in most of the world; notable exceptions are the United States and the road network of the United Kingdom where the statute mile is the official unit used.

Wikipedia page of kilometers

Footnotes

[1] The precision is 15 significant digits (fourteen digits to the right of the decimal point).

Results may contain small errors due to the use of floating point arithmetic.