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 21 knots into feet per second we have to multiply 21 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

21 kt → V_(ft/s)

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

V_(ft/s) = 21 kt × 1.6878098570997 ft/s

V_(ft/s) = 35.444006999094 ft/s

The final result is:

21 kt → 35.444006999094 ft/s

We conclude that 21 knots is equivalent to 35.444006999094 feet per second:

21 knots = 35.444006999094 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 0.028213514347448 × 21 knots.

Another way is saying that 21 knots is equal to 1 ÷ 0.028213514347448 feet per second.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that twenty-one knots is approximately thirty-five point four four four feet per second:

21 kt ≅ 35.444 ft/s

An alternative is also that one foot per second is approximately zero point zero two eight times twenty-one 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