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Buoyancy Calculator

Compute buoyant force in Newtons for fully or partially submerged objects.

How to Use This Calculator

  1. Enter fluid density (kg/m³).
  2. Enter object volume and submerged fraction (0–1).
  3. Click Calculate to get buoyant force in Newtons.

Formula

Fb = ρ g (V · fraction)

For fully submerged bodies, fraction = 1; for floating bodies, fraction is the submerged volume ratio.

Frequently Asked Questions

Why does fraction matter?

Partially submerged objects displace less fluid, reducing buoyant force proportionally.

What if the object sinks?

Then fraction = 1 until contact or compression changes volume.