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Boat Displacement Calculator

Displacement of a hull from its dimensions and block coefficient, in tonnes and volume.

Enter values

Sailing yacht 0.35–0.45, motor cruiser 0.5–0.6, barge 0.8

Results update as you type.

Result

Displacement

15.498 tonnes

Displaced volume
15.12 m³
In kilograms
15,498
In long tons
15.253
Displacement–length ratio
592.5
Buoyant force
151.98 kN

About the Boat Displacement Calculator

Displacement of a hull from its dimensions and block coefficient, in tonnes and volume.

Also known as: hull displacement calculator, boat weight from dimensions, displacement tonnage.

How to use this calculator

  1. Enter waterline length, waterline beam, draft, block coefficient and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

displacement = L × B × T × Cb × water density

Worked example

Using the values pre-filled in the calculator above:

  • Waterline length = 9 m
  • Waterline beam = 3 m
  • Draft = 1.4 m
  • Block coefficient = 0.4
  • Water: Salt water (1025 kg/m³)

the calculator returns:

  • Displacement: 15.498 tonnes
  • Displaced volume: 15.12 m³
  • In kilograms: 15,498
  • In long tons: 15.253