Use our free online hull speed calculator to find out the hull speed of a boat in Knots. Hull Speed, also known as the Displacement Speed of the boat, is the speed at which the wavelength of the boat's bow wave (wave formed at the bow of the ship or boat) is equal to the length of the boat. In this Displacement boat hull speed calculator, enter the boat's waterline length to know the hull speed in knots.
Calculate the hull speed, if the boat's waterline length is 25 feet.
Displacement Boat Hull Speed= 1.34 * √(25)
= 1.34 * 5