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 638 miles per hour into feet per second we have to multiply 638 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

638 mph → V_(ft/s)

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

V_(ft/s) = 638 mph × 1.4666666666667 ft/s

V_(ft/s) = 935.73333333333 ft/s

The final result is:

638 mph → 935.73333333333 ft/s

We conclude that 638 miles per hour is equivalent to 935.73333333333 feet per second:

638 miles per hour = 935.73333333333 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 0.0010686805357652 × 638 miles per hour.

Another way is saying that 638 miles per hour is equal to 1 ÷ 0.0010686805357652 feet per second.

Approximate result

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

638 mph ≅ 935.733 ft/s

An alternative is also that one foot per second is approximately zero point zero zero one times six hundred thirty-eight 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