There are a few different ways to calculate the maximum capacity of a boat. The first way is to use the boat's length and width. This method is called the two-dimensional or 2D method. To use this method, you multiply the length of the boat by its width. This will give you the area of the boat in square feet. You can then divide this number by 15 (this is how many square feet one person takes up on average). This will give you an estimate of how many people can fit on the boat.
The second way to calculate maximum capacity is to use the boat's length, width, and height. This method is called the three-dimensional or 3D method. To use this method, you first need to find the volume of the boat. To do this, you multiply the length of the boat by its width and height. Once you have this number, you can divide it by 27 (this is how many cubic feet one person takes up on average). This will give you an estimate of how many people can fit in the boat when it is full.
Keep in mind that these methods are only estimates because there are other factors that come into play when determining how many people can fit on a boat, such as furniture and equipment onboard.