Conversion formula

The conversion factor from kilometers per hour to feet per second is 0.91134441528215, which means that 1 kilometer per hour is equal to 0.91134441528215 feet per second:

1 km/h = 0.91134441528215 ft/s

To convert 428.7 kilometers per hour into feet per second we have to multiply 428.7 by the conversion factor in order to get the velocity amount from kilometers per hour to feet per second. We can also form a simple proportion to calculate the result:

1 km/h → 0.91134441528215 ft/s

428.7 km/h → V_(ft/s)

Solve the above proportion to obtain the velocity V in feet per second:

V_(ft/s) = 428.7 km/h × 0.91134441528215 ft/s

V_(ft/s) = 390.69335083146 ft/s

The final result is:

428.7 km/h → 390.69335083146 ft/s

We conclude that 428.7 kilometers per hour is equivalent to 390.69335083146 feet per second:

428.7 kilometers per hour = 390.69335083146 feet per second

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 foot per second is equal to 0.0025595521343576 × 428.7 kilometers per hour.

Another way is saying that 428.7 kilometers per hour is equal to 1 ÷ 0.0025595521343576 feet per second.

Approximate result

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

428.7 km/h ≅ 390.693 ft/s

An alternative is also that one foot per second is approximately zero point zero zero three times four hundred twenty-eight point seven kilometers per hour.

Conversion table

kilometers per hour to feet per second chart

For quick reference purposes, below is the conversion table you can use to convert from kilometers per hour to feet per second