Enter the waterline length of a moving boat into the calculator to determine the estimated boat speed.

Boat Speed Formula

The following equation can be used to calculate the boat speed.

S = 10.34*(WLS/WLM)-10.34

  • Where S is the boat speed in knots
  • WLM is the waterline length when moving (feet)
  • WLS is the waterline length when stopped (feet)

Boat Speed Definition

A boat speed is the velocity at which a boat is traveling based on it’s waterline while moving and stopped.


What is a water line length?

A water line length of a boat that is in contact with water.

boat speed calculator
boat speed formula