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Fluid Mechanics Calculators

Buoyancy Calculator

Archimedes' principle: buoyant force, apparent weight and whether an object floats or sinks.

Enter values

Results update as you type.

Result

Buoyant force

490.33 N

Object weight
343.23 N
Result
Floats
Apparent weight in fluid
0 N
Submerged when floating
70%

About the Buoyancy Calculator

Archimedes' principle: buoyant force, apparent weight and whether an object floats or sinks.

Also known as: archimedes principle, buoyant force, will it float, displacement force.

How to use this calculator

  1. Enter object volume, object density, fluid density.
  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

F_b = ρ_fluid × g × V_displaced

Worked example

Using the values pre-filled in the calculator above:

  • Object volume = 0.05 m³
  • Object density = 700 kg/m³
  • Fluid density = 1,000 kg/m³

the calculator returns:

  • Buoyant force: 490.33 N
  • Object weight: 343.23 N
  • Result: Floats
  • Apparent weight in fluid: 0 N