propCalc online boat propeller sizing and speed prediction tool. Estimate your boat’s speed, size your propellers and evaluate your current performance.
Boat owners, engine vendors or yards can use our online propeller calculator, propCalc, to estimate the performance of a planing boat, choose the right diameter and pitch of the propeller or evaluate the existing setup. propCalc is easy to use and requires no installation as well as minimum user input. It is the ideal practical tool for quick performance evaluation of new or existing boats, propeller sizing, and re-powering.
With propCalc you can estimate your maximum boat speed, size your propeller(s) and estimate speed and fuel consumption for the whole RPM range of your diesel or gasoline engine(s). propCalc enables you to input current performance from sea-trial results or similar boats. You can evaluate current propeller performance and view the respective power curves.