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Buoyancy Calculator

Calculate buoyant force, displacement, and stability characteristics based on hull dimensions.

Quick Samples
Try these common configurations to get started

25ft Sailboat

Typical displacement cruiser

18ft Powerboat

Lightweight planing hull

40ft Catamaran

Wide, stable multihull

Hull Dimensions
Enter your boat's principal dimensions
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About This Tool
The Buoyancy Calculator helps you understand the fundamental forces that keep a boat afloat. Based on Archimedes' Principle, this tool calculates the total buoyant force, displacement, and key stability indicators like Metacentric Height (GM). By inputting your hull's basic dimensions, you can get a clear picture of its buoyancy characteristics and reserve stability, which are critical for safety and performance.

Key Concepts:

Buoyant Force: The upward force from the water that counteracts the boat's weight.
Displacement: The weight of water displaced by the hull, which equals the boat's total weight.
Metacentric Height (GM): A primary measure of a boat's initial stability. Higher GM means a 'stiffer' boat.
Reserve Buoyancy: The volume of the hull above the waterline, which provides a safety margin in waves.
Frequently Asked Questions

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