1 kilometer in millimeters
Result
The conversion result is: 1 kilometer is equivalent to 1000000 millimeters.[1]
Conversion in the opposite direction
The inverse of the conversion factor is that 1 millimeter is equal to 1e-06 times 1 kilometer.
It can also be expressed as: 1 kilometer is equal to 1 / 1e-06 millimeters.
Approximation
An approximate numerical result would be: one kilometer is about one million millimeters, or alternatively, a millimeter is about zero times one kilometer.
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.