Conversion formula

The conversion factor from miles per hour to feet per second is 1.4666666666667, which means that 1 mile per hour is equal to 1.4666666666667 feet per second:

1 mph = 1.4666666666667 ft/s

To convert 8400 miles per hour into feet per second we have to multiply 8400 by the conversion factor in order to get the velocity amount from miles per hour to feet per second. We can also form a simple proportion to calculate the result:

1 mph → 1.4666666666667 ft/s

8400 mph → V_(ft/s)

Solve the above proportion to obtain the velocity V in feet per second:

V_(ft/s) = 8400 mph × 1.4666666666667 ft/s

V_(ft/s) = 12320 ft/s

The final result is:

8400 mph → 12320 ft/s

We conclude that 8400 miles per hour is equivalent to 12320 feet per second:

8400 miles per hour = 12320 feet per second

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 foot per second is equal to 8.1168831168831E-5 × 8400 miles per hour.

Another way is saying that 8400 miles per hour is equal to 1 ÷ 8.1168831168831E-5 feet per second.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that eight thousand four hundred miles per hour is approximately twelve thousand three hundred twenty feet per second:

8400 mph ≅ 12320 ft/s

An alternative is also that one foot per second is approximately zero times eight thousand four hundred miles per hour.

Conversion table

miles per hour to feet per second chart

For quick reference purposes, below is the conversion table you can use to convert from miles per hour to feet per second