## 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 feet per second into kilometers per hour we have to multiply 646 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 ft/s → V(km/h)

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

V(km/h) = 646 ft/s × 1.0972799999991 km/h

V(km/h) = 708.84287999943 km/h

The final result is:

646 ft/s → 708.84287999943 km/h

We conclude that 646 feet per second is equivalent to 708.84287999943 kilometers per hour:

646 feet per second = 708.84287999943 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 0.0014107498688578 × 646 feet per second.

Another way is saying that 646 feet per second is equal to 1 ÷ 0.0014107498688578 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 feet per second is approximately seven hundred eight point eight four three kilometers per hour:

646 ft/s ≅ 708.843 km/h

An alternative is also that one kilometer per hour is approximately zero point zero zero one times six hundred forty-six 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)
647 feet per second 709.94 kilometers per hour
648 feet per second 711.037 kilometers per hour
649 feet per second 712.135 kilometers per hour
650 feet per second 713.232 kilometers per hour
651 feet per second 714.329 kilometers per hour
652 feet per second 715.427 kilometers per hour
653 feet per second 716.524 kilometers per hour
654 feet per second 717.621 kilometers per hour
655 feet per second 718.718 kilometers per hour
656 feet per second 719.816 kilometers per hour