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 646.7 feet per second into kilometers per hour we have to multiply 646.7 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

646.7 ft/s → V_(km/h)

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

V_(km/h) = 646.7 ft/s × 1.0972799999991 km/h

V_(km/h) = 709.61097599943 km/h

The final result is:

646.7 ft/s → 709.61097599943 km/h

We conclude that 646.7 feet per second is equivalent to 709.61097599943 kilometers per hour:

646.7 feet per second = 709.61097599943 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 0.0014092228471968 × 646.7 feet per second.

Another way is saying that 646.7 feet per second is equal to 1 ÷ 0.0014092228471968 kilometers per hour.

Approximate result

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

646.7 ft/s ≅ 709.611 km/h

An alternative is also that one kilometer per hour is approximately zero point zero zero one times six hundred forty-six point seven 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