Buoyancy Force Calculator
Apply Archimedes’ principle to calculate the weight of fluid displaced by an immersed object.
How to use this calculator
- Enter fluid density, displaced volume and gravitational acceleration.
- Check that every input uses the stated units and covers the same period, population or project scope.
- Change one assumption at a time when comparing scenarios.
Formula used by buoyancy force calculator
Fᵦ = ρfluid × Vdisplaced × g
- Fᵦ = ρfluid × Vdisplaced × g
- Buoyant force alone does not determine whether an object floats; object weight, immersion and fluid conditions also matter.
- Inputs are validated against the tool-specific constraints; displayed results are rounded for readability.
Worked examples
Worked example
Displacing 0.025 m³ of water produces a buoyant force of roughly 245 N at standard gravity.
The tool multiplies fluid density, displaced volume and gravitational acceleration.
The tool multiplies fluid density, displaced volume and gravitational acceleration.
Understanding the result
Apply Archimedes’ principle to calculate the weight of fluid displaced by an immersed object.
Buoyant force alone does not determine whether an object floats; object weight, immersion and fluid conditions also matter.
Important notes
Buoyant force alone does not determine whether an object floats; object weight, immersion and fluid conditions also matter.
Treat the result as an estimate for the assumptions entered; verify important specifications against the relevant source or professional guidance.
Frequently asked questions
Is displaced volume the object’s full volume?
Only if the object is fully immersed; a partly immersed object displaces a smaller fluid volume.
Does buoyant force include the object’s weight?
No. Net force depends on buoyancy and the other forces acting on the object.
How should I use this result?
Enter fluid density, displaced volume and gravitational acceleration.
Related calculators
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- Gravitational Force Calculator — Estimate the mutual gravitational attraction between two masses separated by a center-to-center distance.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.