Boat Speed Calculator

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Calculates the theoretical top speed of a boat based on its horsepower and displacement.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Engine Horsepower (HP) and Boat Displacement in the units shown.

Step 2

Read Speed Factor and Theoretical Top Speed in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Engine Horsepower (HP): 150 HP; Boat Displacement: 3,000 lbs

Speed Factor: 0.7211247852 HP/(lbs^(2/3)); Theoretical Top Speed: 0.7642715983 knots

Engine Horsepower (HP): 300 HP; Boat Displacement: 8,000 lbs

Speed Factor: 0.75 HP/(lbs^(2/3)); Theoretical Top Speed: 0.7794228634 knots

Engine Horsepower (HP): 800 HP; Boat Displacement: 15,000 lbs

Speed Factor: 1.315313106 HP/(lbs^(2/3)); Theoretical Top Speed: 1.032183906 knots

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