Buoyant Force Calculator

Your details

Select a common fluid or choose Custom density to enter your own value.
Volume of fluid displaced by the submerged part of the object, in cubic metres.
m3
Standard Earth gravity is 9.81 m/s2. Use 3.72 for Mars, 1.62 for the Moon, or 24.79 for Jupiter.
m/s2
Buoyant forceModerate upthrust
9.81N

Upward force exerted by the fluid on the submerged object (Newtons)

Displaced fluid mass1kg
Displaced fluid weight9.81N
Fluid density used1,000kg/m3
Displaced volume (m3)0.001m3
Buoyant force (N)9.81
Weight of displaced fluid (N)9.81

Buoyant force: 9.81 N (upward).

  • The object displaces 1.000 kg of Fresh water, which is exactly the mass equivalent of the 9.81 N upward push it experiences.
  • An object with this exact volume would be neutrally buoyant if its total mass is 1.000 kg (density equal to 1000.0 kg/m3).
  • Buoyant force depends only on what the fluid displaces, not on the object's own density or material.

Next stepTo check whether an object floats, compare this buoyant force to the object's weight (mass x g). If the buoyant force is greater, the object floats.

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