## 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 121 feet per second into miles per hour we have to multiply 121 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

121 ft/s → V(mph)

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

V(mph) = 121 ft/s × 0.68181818181818 mph

V(mph) = 82.5 mph

The final result is:

121 ft/s → 82.5 mph

We conclude that 121 feet per second is equivalent to 82.5 miles per hour:

121 feet per second = 82.5 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 0.012121212121212 × 121 feet per second.

Another way is saying that 121 feet per second is equal to 1 ÷ 0.012121212121212 miles per hour.

## Approximate result

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

121 ft/s ≅ 82.5 mph

An alternative is also that one mile per hour is approximately zero point zero one two times one hundred twenty-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)
122 feet per second 83.182 miles per hour
123 feet per second 83.864 miles per hour
124 feet per second 84.545 miles per hour
125 feet per second 85.227 miles per hour
126 feet per second 85.909 miles per hour
127 feet per second 86.591 miles per hour
128 feet per second 87.273 miles per hour
129 feet per second 87.955 miles per hour
130 feet per second 88.636 miles per hour
131 feet per second 89.318 miles per hour