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 840 feet per second into kilometers per hour we have to multiply 840 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

840 ft/s → V_(km/h)

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

V_(km/h) = 840 ft/s × 1.0972799999991 km/h

V_(km/h) = 921.71519999926 km/h

The final result is:

840 ft/s → 921.71519999926 km/h

We conclude that 840 feet per second is equivalent to 921.71519999926 kilometers per hour:

840 feet per second = 921.71519999926 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 0.0010849338277168 × 840 feet per second.

Another way is saying that 840 feet per second is equal to 1 ÷ 0.0010849338277168 kilometers per hour.

Approximate result

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

840 ft/s ≅ 921.715 km/h

An alternative is also that one kilometer per hour is approximately zero point zero zero one times eight hundred forty 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