40 millimeters in kilometers

Result

The conversion result is: 40 millimeters is equivalent to 4e-05 kilometers.^[1]

Conversion formula
How to convert 40 millimeters to kilometers?

We know (by definition) that: 1 mm = 1e-06 km.

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

1 mm / 40 mm = 1e-06 km / x km

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

x km = (40 mm / 1 mm) * 1e-06 km → x km = 3.9999999999999996e-05 km

Conclusion:

40 mm = 3.9999999999999996e-05 km

Conversion in the opposite direction

The inverse of the conversion factor is that 1 kilometer is equal to 25000 times 40 millimeters.

It can also be expressed as: 40 millimeters is equal to 1 / 25000 kilometers.

Approximation

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