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 688 feet per second into miles per hour we have to multiply 688 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

688 ft/s → V_(mph)

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

V_(mph) = 688 ft/s × 0.68181818181818 mph

V_(mph) = 469.09090909091 mph

The final result is:

688 ft/s → 469.09090909091 mph

We conclude that 688 feet per second is equivalent to 469.09090909091 miles per hour:

688 feet per second = 469.09090909091 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 0.0021317829457364 × 688 feet per second.

Another way is saying that 688 feet per second is equal to 1 ÷ 0.0021317829457364 miles per hour.

Approximate result

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

688 ft/s ≅ 469.091 mph

An alternative is also that one mile per hour is approximately zero point zero zero two times six hundred eighty-eight 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