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 391.5 knots into feet per second we have to multiply 391.5 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

391.5 kt → V_(ft/s)

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

V_(ft/s) = 391.5 kt × 1.6878098570997 ft/s

V_(ft/s) = 660.77755905455 ft/s

The final result is:

391.5 kt → 660.77755905455 ft/s

We conclude that 391.5 knots is equivalent to 660.77755905455 feet per second:

391.5 knots = 660.77755905455 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 0.0015133685856869 × 391.5 knots.

Another way is saying that 391.5 knots is equal to 1 ÷ 0.0015133685856869 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-one point five knots is approximately six hundred sixty point seven seven eight feet per second:

391.5 kt ≅ 660.778 ft/s

An alternative is also that one foot per second is approximately zero point zero zero two times three hundred ninety-one point five 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