## 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 31 feet per second into miles per hour we have to multiply 31 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

31 ft/s → V(mph)

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

V(mph) = 31 ft/s × 0.68181818181818 mph

V(mph) = 21.136363636364 mph

The final result is:

31 ft/s → 21.136363636364 mph

We conclude that 31 feet per second is equivalent to 21.136363636364 miles per hour:

31 feet per second = 21.136363636364 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 0.047311827956989 × 31 feet per second.

Another way is saying that 31 feet per second is equal to 1 ÷ 0.047311827956989 miles per hour.

## Approximate result

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

31 ft/s ≅ 21.136 mph

An alternative is also that one mile per hour is approximately zero point zero four seven times thirty-one 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)
32 feet per second 21.818 miles per hour
33 feet per second 22.5 miles per hour
34 feet per second 23.182 miles per hour
35 feet per second 23.864 miles per hour
36 feet per second 24.545 miles per hour
37 feet per second 25.227 miles per hour
38 feet per second 25.909 miles per hour
39 feet per second 26.591 miles per hour
40 feet per second 27.273 miles per hour
41 feet per second 27.955 miles per hour