Conversion formula

The conversion factor from feet to kilometers is 0.0003048, which means that 1 foot is equal to 0.0003048 kilometers:

1 ft = 0.0003048 km

To convert 138.4 feet into kilometers we have to multiply 138.4 by the conversion factor in order to get the length amount from feet to kilometers. We can also form a simple proportion to calculate the result:

1 ft → 0.0003048 km

138.4 ft → L_(km)

Solve the above proportion to obtain the length L in kilometers:

L_(km) = 138.4 ft × 0.0003048 km

L_(km) = 0.04218432 km

The final result is:

138.4 ft → 0.04218432 km

We conclude that 138.4 feet is equivalent to 0.04218432 kilometers:

138.4 feet = 0.04218432 kilometers

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer is equal to 23.705490570904 × 138.4 feet.

Another way is saying that 138.4 feet is equal to 1 ÷ 23.705490570904 kilometers.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that one hundred thirty-eight point four feet is approximately zero point zero four two kilometers:

138.4 ft ≅ 0.042 km

An alternative is also that one kilometer is approximately twenty-three point seven zero five times one hundred thirty-eight point four feet.

Conversion table

feet to kilometers chart

For quick reference purposes, below is the conversion table you can use to convert from feet to kilometers