## 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 660 feet per second into miles per hour we have to multiply 660 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

660 ft/s → V(mph)

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

V(mph) = 660 ft/s × 0.68181818181818 mph

V(mph) = 450 mph

The final result is:

660 ft/s → 450 mph

We conclude that 660 feet per second is equivalent to 450 miles per hour:

660 feet per second = 450 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 0.0022222222222222 × 660 feet per second.

Another way is saying that 660 feet per second is equal to 1 ÷ 0.0022222222222222 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 sixty feet per second is approximately four hundred fifty miles per hour:

660 ft/s ≅ 450 mph

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

feet per second (ft/s) miles per hour (mph)
661 feet per second 450.682 miles per hour
662 feet per second 451.364 miles per hour
663 feet per second 452.045 miles per hour
664 feet per second 452.727 miles per hour
665 feet per second 453.409 miles per hour
666 feet per second 454.091 miles per hour
667 feet per second 454.773 miles per hour
668 feet per second 455.455 miles per hour
669 feet per second 456.136 miles per hour
670 feet per second 456.818 miles per hour