Floating Dock Design Calculator

Calculate buoyancy, draft, freeboard, reserve buoyancy, and metacentric height (GM) for rectangular floating docks, pontoons, and barges.

Pontoon length (m)

Pontoon beam / width (m)

Pontoon depth (m)

Dead weight (kg)

Live load (kg)

KG — center of gravity above keel (m)

Water density (kg/m³)

Tab to move between fields

Draft (m)

0.57

Freeboard (m)

1.43

Metacentric height GM (m)

4.56

Displaced volume (m³)68.29

Reserve buoyancy (%)71.5

Displacement (tonnes)70

Tonnes per cm immersion1.23

Is OverloadedNo

How to Use This Calculator

Enter pontoon dimensions: length (m), beam (m), and depth (m).
Enter dead weight (kg) and live load (kg) for the pontoon.
Read draft (m), freeboard (m), and displacement (tonnes).
Check GM (metacentric height, m) for stability — positive GM indicates stable upright equilibrium.
Verify reserve buoyancy (%) and load capacity to ensure safe operational margins.

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