## 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 4.2 feet per second into miles per hour we have to multiply 4.2 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

4.2 ft/s → V(mph)

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

V(mph) = 4.2 ft/s × 0.68181818181818 mph

V(mph) = 2.8636363636364 mph

The final result is:

4.2 ft/s → 2.8636363636364 mph

We conclude that 4.2 feet per second is equivalent to 2.8636363636364 miles per hour:

4.2 feet per second = 2.8636363636364 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 0.34920634920635 × 4.2 feet per second.

Another way is saying that 4.2 feet per second is equal to 1 ÷ 0.34920634920635 miles per hour.

## Approximate result

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

4.2 ft/s ≅ 2.864 mph

An alternative is also that one mile per hour is approximately zero point three four nine times four point two 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)
5.2 feet per second 3.545 miles per hour
6.2 feet per second 4.227 miles per hour
7.2 feet per second 4.909 miles per hour
8.2 feet per second 5.591 miles per hour
9.2 feet per second 6.273 miles per hour
10.2 feet per second 6.955 miles per hour
11.2 feet per second 7.636 miles per hour
12.2 feet per second 8.318 miles per hour
13.2 feet per second 9 miles per hour
14.2 feet per second 9.682 miles per hour