Conversion formula

The conversion factor from feet per second to miles per hour is 0.68181818181818, which means that 1 foot per second is equal to 0.68181818181818 miles per hour:

1 ft/s = 0.68181818181818 mph

To convert 6390 feet per second into miles per hour we have to multiply 6390 by the conversion factor in order to get the velocity amount from feet per second to miles per hour. We can also form a simple proportion to calculate the result:

1 ft/s → 0.68181818181818 mph

6390 ft/s → V_(mph)

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

V_(mph) = 6390 ft/s × 0.68181818181818 mph

V_(mph) = 4356.8181818182 mph

The final result is:

6390 ft/s → 4356.8181818182 mph

We conclude that 6390 feet per second is equivalent to 4356.8181818182 miles per hour:

6390 feet per second = 4356.8181818182 miles per hour

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 mile per hour is equal to 0.00022952529994784 × 6390 feet per second.

Another way is saying that 6390 feet per second is equal to 1 ÷ 0.00022952529994784 miles per hour.

Approximate result

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

6390 ft/s ≅ 4356.818 mph

An alternative is also that one mile per hour is approximately zero times six thousand three hundred ninety feet per second.

Conversion table

feet per second to miles per hour chart

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