With this information, you can calculate the quantity of feet per second 4 knots is equal to.

¿What is the inverse calculation between 1 foot per second and 4 knots?

Performing the inverse calculation of the relationship between units, we obtain that 1 foot per second is 0.14812095 times 4 knots.

Which is the same to say that 4 knots is 6.7512394 feet per second.

Four knots equals to six feet per second. *Approximation

A foot per second is zero times four knots. *Approximation