Load Capacity Calculator ⚖️
Calculate maximum passenger capacity and weight limit for your boat based on hull length, beam, and boat type.
How to Use the Load Capacity Calculator
Enter hull length and beam to calculate maximum persons and weight. Formula: Max persons = (L×W)/15.
Pontoon boats apply a 1.3x factor, V-hull 1.0x, flat-bottom 0.9x.
Never exceed the legal maximum capacity. Overloading greatly increases the risk of capsizing.
FAQ
How is boat load capacity calculated?
The USCG formula for maximum persons: (Hull length × Beam) / 15. For maximum weight: persons × 150 lbs + gear weight. Pontoon boats apply a 1.3x factor, V-hull 1.0x, flat-bottom 0.9x. Always check the capacity plate on your boat for the official rating.
What happens if I overload my boat?
Overloading is extremely dangerous. It reduces freeboard (distance from waterline to gunwale), making the boat more susceptible to swamping. It affects stability, handling, and stopping distance. Overloading is a leading cause of boating accidents and fatalities. Never exceed the capacity plate rating.
Does the capacity plate account for fuel and gear?
The capacity plate shows maximum persons AND maximum weight (persons + gear + fuel). These are separate limits — you must comply with both. A boat rated for 6 persons and 1,200 lbs total means 6 people at 150 lbs each = 900 lbs, leaving only 300 lbs for fuel and gear.
How does weather affect safe load capacity?
In rough conditions, reduce your load significantly below the maximum. Waves and wakes can swamp an overloaded boat. In calm conditions, you can approach the maximum. As a rule of thumb, reduce capacity by 25-50% in choppy water or when operating offshore.
What is freeboard and why is it important?
Freeboard is the distance from the waterline to the top of the hull (gunwale). More freeboard means more safety margin before water enters the boat. As you add weight, freeboard decreases. Minimum safe freeboard varies by boat type, but generally 6-12 inches is considered minimum for recreational boats.