Boat Horsepower Calculator

Total boat weight, including fuel and passengers (lb) Target speed (knots) Hull type

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This is an estimate for planing boats. Actual performance depends on hull design, propeller efficiency, trim, loading, water conditions, and engine power at the propeller shaft.

Prospective motorboat buyers, whether in the market for a brand-new or used vessel, eventually have to decide how big of a motor they want. While powerboat companies and their respective print ads would have you believe that everyone needs a direct-injected, two-stroke, 250-horsepower engine, that may not be the case – but there may be some truth to the saying “bigger is better” when discussing watercraft engines.

When deciding what size motor to put on your boat, there are things to keep in mind, according to Boating Magazine:

Define and prioritize the main uses of the boat.
Choose a motor that is in compliance with the rated-safety range of the boat.
Look for the largest motor you can afford that will meet the required criteria.
Fuel Efficiency

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