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 639 feet per second into knots we have to multiply 639 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

639 ft/s → V_(kt)

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

V_(kt) = 639 ft/s × 0.59248380129641 kt

V_(kt) = 378.5971490284 kt

The final result is:

639 ft/s → 378.5971490284 kt

We conclude that 639 feet per second is equivalent to 378.5971490284 knots:

639 feet per second = 378.5971490284 knots

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 knot is equal to 0.0026413299798118 × 639 feet per second.

Another way is saying that 639 feet per second is equal to 1 ÷ 0.0026413299798118 knots.

Approximate result

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

639 ft/s ≅ 378.597 kt

An alternative is also that one knot is approximately zero point zero zero three times six hundred thirty-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