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 421 miles per hour into feet per second we have to multiply 421 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

421 mph → V_(ft/s)

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

V_(ft/s) = 421 mph × 1.4666666666667 ft/s

V_(ft/s) = 617.46666666667 ft/s

The final result is:

421 mph → 617.46666666667 ft/s

We conclude that 421 miles per hour is equivalent to 617.46666666667 feet per second:

421 miles per hour = 617.46666666667 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 0.0016195206218959 × 421 miles per hour.

Another way is saying that 421 miles per hour is equal to 1 ÷ 0.0016195206218959 feet per second.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that four hundred twenty-one miles per hour is approximately six hundred seventeen point four six seven feet per second:

421 mph ≅ 617.467 ft/s

An alternative is also that one foot per second is approximately zero point zero zero two times four hundred twenty-one 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