How do you calculate maximum people on boat less than 20 feet?

To calculate the maximum number of people allowed on a boat less than 20 feet, you can use the U.S. Coast Guard's formula, which suggests one person for every 2 feet of boat length. Therefore, for a boat under 20 feet, the maximum capacity would typically be 10 people. However, always refer to the boat's capacity plate, as it provides specific limits based on design and safety considerations.