## 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 21 feet per second into kilometers per hour we have to multiply 21 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

21 ft/s → V(km/h)

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

V(km/h) = 21 ft/s × 1.0972799999991 km/h

V(km/h) = 23.042879999982 km/h

The final result is:

21 ft/s → 23.042879999982 km/h

We conclude that 21 feet per second is equivalent to 23.042879999982 kilometers per hour:

21 feet per second = 23.042879999982 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 0.043397353108674 × 21 feet per second.

Another way is saying that 21 feet per second is equal to 1 ÷ 0.043397353108674 kilometers per hour.

## Approximate result

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

21 ft/s ≅ 23.043 km/h

An alternative is also that one kilometer per hour is approximately zero point zero four three times twenty-one 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)
22 feet per second 24.14 kilometers per hour
23 feet per second 25.237 kilometers per hour
24 feet per second 26.335 kilometers per hour
25 feet per second 27.432 kilometers per hour
26 feet per second 28.529 kilometers per hour
27 feet per second 29.627 kilometers per hour
28 feet per second 30.724 kilometers per hour
29 feet per second 31.821 kilometers per hour
30 feet per second 32.918 kilometers per hour
31 feet per second 34.016 kilometers per hour