138 feet in kilometers

Conversion formula
How to convert 138 feet to kilometers?

We know (by definition) that: $1\mathrm{ft}=0.0003048\mathrm{km}$

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

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

Conclusion: 138 ⁢ ft = 0.0420624 ⁢ km

Conversion in the opposite direction

The inverse of the conversion factor is that 1 kilometer is equal to 23.7742021377763 times 138 feet.

It can also be expressed as: 138 feet is equal to $\frac{1}{\mathrm{23.7742021377763}}$ kilometers.

Approximation

An approximate numerical result would be: one hundred and thirty-eight feet is about zero point zero four kilometers, or alternatively, a kilometer is about twenty-three point seven six times one hundred and thirty-eight feet.