Please note - by using this calculator you agree to the following license provisions:
This calculator is for non-commercial use by the general public only. It is proved for entertainment only and not intended to be used for any other purpose. Commercial use for any reason is prohibited. A license for commercial use may be available upon application to BAM Marine on a per use or annual basis.
There are so many factors that affect boat speed that it is hard to make accurate estimates of what the real top end will be. Mercury Marine uses the following formula to estimate potential top end, this calculator uses this formula.
The Square Root of (Total Shaft Horsepower / Weight ) x Constant = Speed
The constants have been developed from experience, and are as follows:
The constants above are from close to 20 years ago. There have been so many changes in hull design that today they are not even close. To be honest our business has changed and we have not done enough recent testting to update them. The best thing to do is calculate a constant from published tests or your personal setup and go from there.
The calculator below uses the above formula. Plug in your info, and click "Calculate" on the item you want to compute. By using known values for the weight, power and speed you can come up with a more accurate constant for your boat. You can then see what effect changes to weight or power will have on top speed. Using the calculator in this fashion will produce surprisingly accurate results.