300 millimeters in kilometers

Conversion formula
How to convert 300 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: 300 ⁢ mm = 0.0003 ⁢ km

Conversion in the opposite direction

The inverse of the conversion factor is that 1 kilometer is equal to 3333.33333333333 times 300 millimeters.

It can also be expressed as: 300 millimeters is equal to $\frac{1}{\mathrm{3333.33333333333}}$ kilometers.

Approximation

An approximate numerical result would be: three hundred millimeters is about zero kilometers, or alternatively, a kilometer is about three thousand, three hundred and thirty-three point three two times three hundred millimeters.