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 8420 feet per second into kilometers per hour we have to multiply 8420 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

8420 ft/s → V_(km/h)

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

V_(km/h) = 8420 ft/s × 1.0972799999991 km/h

V_(km/h) = 9239.0975999926 km/h

The final result is:

8420 ft/s → 9239.0975999926 km/h

We conclude that 8420 feet per second is equivalent to 9239.0975999926 kilometers per hour:

8420 feet per second = 9239.0975999926 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 0.0001082356787746 × 8420 feet per second.

Another way is saying that 8420 feet per second is equal to 1 ÷ 0.0001082356787746 kilometers per hour.

Approximate result

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

8420 ft/s ≅ 9239.098 km/h

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