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 3990 miles per hour into feet per second we have to multiply 3990 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

3990 mph → V_(ft/s)

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

V_(ft/s) = 3990 mph × 1.4666666666667 ft/s

V_(ft/s) = 5852 ft/s

The final result is:

3990 mph → 5852 ft/s

We conclude that 3990 miles per hour is equivalent to 5852 feet per second:

3990 miles per hour = 5852 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 0.00017088174982912 × 3990 miles per hour.

Another way is saying that 3990 miles per hour is equal to 1 ÷ 0.00017088174982912 feet per second.

Approximate result

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

3990 mph ≅ 5852 ft/s

An alternative is also that one foot per second is approximately zero times three thousand nine hundred ninety 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