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 4221 feet per second into kilometers per hour we have to multiply 4221 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

4221 ft/s → V_(km/h)

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

V_(km/h) = 4221 ft/s × 1.0972799999991 km/h

V_(km/h) = 4631.6188799963 km/h

The final result is:

4221 ft/s → 4631.6188799963 km/h

We conclude that 4221 feet per second is equivalent to 4631.6188799963 kilometers per hour:

4221 feet per second = 4631.6188799963 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 0.00021590722939639 × 4221 feet per second.

Another way is saying that 4221 feet per second is equal to 1 ÷ 0.00021590722939639 kilometers per hour.

Approximate result

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

4221 ft/s ≅ 4631.619 km/h

An alternative is also that one kilometer per hour is approximately zero times four thousand two hundred 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