Interactive tool
Boat performance calculator
Estimate your boat's hull speed, planing speed, and required horsepower using standard naval architecture formulas. Results are theoretical — actual performance depends on hull condition, trim, and sea state.
Hull Speed Calculator
The theoretical maximum speed of a displacement hull. Planing hulls can exceed this.
The length of the boat at the waterline, not the overall length (LOA). Typically 5-10% shorter than LOA.
About these formulas
These calculations use standard naval architecture formulas (Froude number for hull speed, Crouch's formula for planing speed). They provide theoretical estimates — actual performance depends on hull condition, bottom paint, trim, sea state, and propeller selection. For precise calculations, consult a naval architect.
Learn more about hull speed