Buoyancy Calculator

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Metric reports force in newtons; imperial reports it in pounds-force.
Pick a fluid to fill in its density, or choose Custom to type your own.
The volume of fluid pushed aside, the submerged volume of the object.
Buoyant force scales with local gravity. Choose a body or enter a custom value.
The object’s real mass. Compared against the displaced fluid to decide float or sink.
Buoyant forceFloats: buoyant force exceeds weight
98.1N
Displaced fluid mass10kg
Object weight68.67N
Apparent (immersed) weight-29.43N
Floats or sinksFloats
Fraction submerged when floating70%
Object average density700kg/m³
Buoyant force (up)98.1
Object weight (down)68.67

The fluid pushes up with 98.1 N of buoyant force.

  • Buoyant force equals the weight of the displaced fluid: F = ρ·V·g (Archimedes’ principle).
  • It supports 10 kg of displaced fluid pushed aside.
  • The object floats: buoyancy beats its weight, and at rest about 70% of its volume sits below the surface.

Next stepRoughly 30% of the object rides above the waterline, like an iceberg showing only its tip.

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