## Conversion formula

The conversion factor from feet per second to kilometers per hour is 1.0972799999991, which means that 1 foot per second is equal to 1.0972799999991 kilometers per hour:

1 ft/s = 1.0972799999991 km/h

To convert 4.2 feet per second into kilometers per hour we have to multiply 4.2 by the conversion factor in order to get the velocity amount from feet per second to kilometers per hour. We can also form a simple proportion to calculate the result:

1 ft/s → 1.0972799999991 km/h

4.2 ft/s → V(km/h)

Solve the above proportion to obtain the velocity V in kilometers per hour:

V(km/h) = 4.2 ft/s × 1.0972799999991 km/h

V(km/h) = 4.6085759999963 km/h

The final result is:

4.2 ft/s → 4.6085759999963 km/h

We conclude that 4.2 feet per second is equivalent to 4.6085759999963 kilometers per hour:

4.2 feet per second = 4.6085759999963 kilometers per hour

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer per hour is equal to 0.21698676554337 × 4.2 feet per second.

Another way is saying that 4.2 feet per second is equal to 1 ÷ 0.21698676554337 kilometers per hour.

## Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that four point two feet per second is approximately four point six zero nine kilometers per hour:

4.2 ft/s ≅ 4.609 km/h

An alternative is also that one kilometer per hour is approximately zero point two one seven times four point two feet per second.

## Conversion table

### feet per second to kilometers per hour chart

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

feet per second (ft/s) kilometers per hour (km/h)
5.2 feet per second 5.706 kilometers per hour
6.2 feet per second 6.803 kilometers per hour
7.2 feet per second 7.9 kilometers per hour
8.2 feet per second 8.998 kilometers per hour
9.2 feet per second 10.095 kilometers per hour
10.2 feet per second 11.192 kilometers per hour
11.2 feet per second 12.29 kilometers per hour
12.2 feet per second 13.387 kilometers per hour
13.2 feet per second 14.484 kilometers per hour
14.2 feet per second 15.581 kilometers per hour