## Conversion formula

The conversion factor from feet per second to kilometers per hour is 1.0972799999991, which means that 1 foot per second is equal to 1.0972799999991 kilometers per hour:

1 ft/s = 1.0972799999991 km/h

To convert 391 feet per second into kilometers per hour we have to multiply 391 by the conversion factor in order to get the velocity amount from feet per second to kilometers per hour. We can also form a simple proportion to calculate the result:

1 ft/s → 1.0972799999991 km/h

391 ft/s → V(km/h)

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

V(km/h) = 391 ft/s × 1.0972799999991 km/h

V(km/h) = 429.03647999966 km/h

The final result is:

391 ft/s → 429.03647999966 km/h

We conclude that 391 feet per second is equivalent to 429.03647999966 kilometers per hour:

391 feet per second = 429.03647999966 kilometers per hour

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 kilometer per hour is equal to 0.0023308041311564 × 391 feet per second.

Another way is saying that 391 feet per second is equal to 1 ÷ 0.0023308041311564 kilometers per hour.

## Approximate result

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

391 ft/s ≅ 429.036 km/h

An alternative is also that one kilometer per hour is approximately zero point zero zero two times three hundred ninety-one feet per second.

## Conversion table

### feet per second to kilometers per hour chart

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

feet per second (ft/s) kilometers per hour (km/h)
392 feet per second 430.134 kilometers per hour
393 feet per second 431.231 kilometers per hour
394 feet per second 432.328 kilometers per hour
395 feet per second 433.426 kilometers per hour
396 feet per second 434.523 kilometers per hour
397 feet per second 435.62 kilometers per hour
398 feet per second 436.717 kilometers per hour
399 feet per second 437.815 kilometers per hour
400 feet per second 438.912 kilometers per hour
401 feet per second 440.009 kilometers per hour