9 millimeters in kilometers

Conversion formula
How to convert 9 millimeters to kilometers?

We know (by definition) that: $1\mathrm{mm}=1e-06\mathrm{km}$

We can set up a proportion to solve for the number of kilometers.

Now, we cross multiply to solve for our unknown $x$:

Conclusion: 9 ⁢ mm = 9e-06 ⁢ km

Conversion in the opposite direction

The inverse of the conversion factor is that 1 kilometer is equal to 111111.111111111 times 9 millimeters.

It can also be expressed as: 9 millimeters is equal to $\frac{1}{\mathrm{111111.111111111}}$ kilometers.

Approximation

An approximate numerical result would be: nine millimeters is about zero kilometers, or alternatively, a kilometer is about one hundred and eleven thousand, one hundred and eleven point one one times nine millimeters.