45 kilometers in millimeters

Conversion formula
How to convert 45 kilometers to millimeters?

We know (by definition) that: $1\mathrm{km}=1000000\mathrm{mm}$

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

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

Conclusion: 45 ⁢ km = 45000000 ⁢ mm

Conversion in the opposite direction

The inverse of the conversion factor is that 1 millimeter is equal to 2.22222222222222e-08 times 45 kilometers.

It can also be expressed as: 45 kilometers is equal to $\frac{1}{\mathrm{2.22222222222222e-08}}$ millimeters.

Approximation

An approximate numerical result would be: forty-five kilometers is about forty-five million millimeters, or alternatively, a millimeter is about zero times forty-five kilometers.