Conversion formula

The conversion factor from knots to feet per second is 1.6878098570997, which means that 1 knot is equal to 1.6878098570997 feet per second:

1 kt = 1.6878098570997 ft/s

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

1 kt → 1.6878098570997 ft/s

399 kt → V_(ft/s)

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

V_(ft/s) = 399 kt × 1.6878098570997 ft/s

V_(ft/s) = 673.4361329828 ft/s

The final result is:

399 kt → 673.4361329828 ft/s

We conclude that 399 knots is equivalent to 673.4361329828 feet per second:

399 knots = 673.4361329828 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 0.0014849218077604 × 399 knots.

Another way is saying that 399 knots is equal to 1 ÷ 0.0014849218077604 feet 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 knots is approximately six hundred seventy-three point four three six feet per second:

399 kt ≅ 673.436 ft/s

An alternative is also that one foot per second is approximately zero point zero zero one times three hundred ninety-nine knots.

Conversion table

knots to feet per second chart

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