Conversion formula

The conversion factor from feet per second to meters per second is 0.3048, which means that 1 foot per second is equal to 0.3048 meters per second:

1 ft/s = 0.3048 m/s

To convert 399 feet per second into meters per second we have to multiply 399 by the conversion factor in order to get the velocity amount from feet per second to meters per second. We can also form a simple proportion to calculate the result:

1 ft/s → 0.3048 m/s

399 ft/s → V_(m/s)

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

V_(m/s) = 399 ft/s × 0.3048 m/s

V_(m/s) = 121.6152 m/s

The final result is:

399 ft/s → 121.6152 m/s

We conclude that 399 feet per second is equivalent to 121.6152 meters per second:

399 feet per second = 121.6152 meters per second

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 meter per second is equal to 0.008222656378479 × 399 feet per second.

Another way is saying that 399 feet per second is equal to 1 ÷ 0.008222656378479 meters per second.

Approximate result

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

399 ft/s ≅ 121.615 m/s

An alternative is also that one meter per second is approximately zero point zero zero eight times three hundred ninety-nine feet per second.

Conversion table

feet per second to meters per second chart

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