## 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 618 feet per second into miles per hour we have to multiply 618 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

618 ft/s → V(mph)

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

V(mph) = 618 ft/s × 0.68181818181818 mph

V(mph) = 421.36363636364 mph

The final result is:

618 ft/s → 421.36363636364 mph

We conclude that 618 feet per second is equivalent to 421.36363636364 miles per hour:

618 feet per second = 421.36363636364 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 0.0023732470334412 × 618 feet per second.

Another way is saying that 618 feet per second is equal to 1 ÷ 0.0023732470334412 miles per hour.

## Approximate result

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

618 ft/s ≅ 421.364 mph

An alternative is also that one mile per hour is approximately zero point zero zero two times six hundred eighteen 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)
619 feet per second 422.045 miles per hour
620 feet per second 422.727 miles per hour
621 feet per second 423.409 miles per hour
622 feet per second 424.091 miles per hour
623 feet per second 424.773 miles per hour
624 feet per second 425.455 miles per hour
625 feet per second 426.136 miles per hour
626 feet per second 426.818 miles per hour
627 feet per second 427.5 miles per hour
628 feet per second 428.182 miles per hour