## 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 309 feet per second into miles per hour we have to multiply 309 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

309 ft/s → V(mph)

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

V(mph) = 309 ft/s × 0.68181818181818 mph

V(mph) = 210.68181818182 mph

The final result is:

309 ft/s → 210.68181818182 mph

We conclude that 309 feet per second is equivalent to 210.68181818182 miles per hour:

309 feet per second = 210.68181818182 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 0.0047464940668824 × 309 feet per second.

Another way is saying that 309 feet per second is equal to 1 ÷ 0.0047464940668824 miles per hour.

## Approximate result

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

309 ft/s ≅ 210.682 mph

An alternative is also that one mile per hour is approximately zero point zero zero five times three hundred 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)
310 feet per second 211.364 miles per hour
311 feet per second 212.045 miles per hour
312 feet per second 212.727 miles per hour
313 feet per second 213.409 miles per hour
314 feet per second 214.091 miles per hour
315 feet per second 214.773 miles per hour
316 feet per second 215.455 miles per hour
317 feet per second 216.136 miles per hour
318 feet per second 216.818 miles per hour
319 feet per second 217.5 miles per hour