Conversion formula

The conversion factor from feet per second to knots is 0.59248380129641, which means that 1 foot per second is equal to 0.59248380129641 knots:

1 ft/s = 0.59248380129641 kt

To convert 684.9 feet per second into knots we have to multiply 684.9 by the conversion factor in order to get the velocity amount from feet per second to knots. We can also form a simple proportion to calculate the result:

1 ft/s → 0.59248380129641 kt

684.9 ft/s → V_(kt)

Solve the above proportion to obtain the velocity V in knots:

V_(kt) = 684.9 ft/s × 0.59248380129641 kt

V_(kt) = 405.79215550791 kt

The final result is:

684.9 ft/s → 405.79215550791 kt

We conclude that 684.9 feet per second is equivalent to 405.79215550791 knots:

684.9 feet per second = 405.79215550791 knots

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 knot is equal to 0.0024643157498901 × 684.9 feet per second.

Another way is saying that 684.9 feet per second is equal to 1 ÷ 0.0024643157498901 knots.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that six hundred eighty-four point nine feet per second is approximately four hundred five point seven nine two knots:

684.9 ft/s ≅ 405.792 kt

An alternative is also that one knot is approximately zero point zero zero two times six hundred eighty-four point nine feet per second.

Conversion table

feet per second to knots chart

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