## 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 9.9 feet per second into miles per hour we have to multiply 9.9 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

9.9 ft/s → V(mph)

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

V(mph) = 9.9 ft/s × 0.68181818181818 mph

V(mph) = 6.75 mph

The final result is:

9.9 ft/s → 6.75 mph

We conclude that 9.9 feet per second is equivalent to 6.75 miles per hour:

9.9 feet per second = 6.75 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 0.14814814814815 × 9.9 feet per second.

Another way is saying that 9.9 feet per second is equal to 1 ÷ 0.14814814814815 miles per hour.

## Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that nine point nine feet per second is approximately six point seven five miles per hour:

9.9 ft/s ≅ 6.75 mph

An alternative is also that one mile per hour is approximately zero point one four eight times nine point nine 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)
10.9 feet per second 7.432 miles per hour
11.9 feet per second 8.114 miles per hour
12.9 feet per second 8.795 miles per hour
13.9 feet per second 9.477 miles per hour
14.9 feet per second 10.159 miles per hour
15.9 feet per second 10.841 miles per hour
16.9 feet per second 11.523 miles per hour
17.9 feet per second 12.205 miles per hour
18.9 feet per second 12.886 miles per hour
19.9 feet per second 13.568 miles per hour