Maybe this link can help:
Calculating Boat Capacity

Even though it says Pennsylvania, you get the weight capacity by multiplying the number of people by an average weight of 150lbs. (weight takes into account people and gear, not motor). You get the number of people by multiplying the boat length by its width, then dividing by 15. Figure out the max HP for your motor, get its weight and there you have it.

https://www.boat-ed.com/images/drawi...city_plate.jpg

:clap::clap:

just added to the link page

I found this. It was posted by a member here a while back. Hope link works.
http://i92.photobucket.com/albums/l4...psdb3a1576.jpg