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Calculators / Science / Buoyant force
Buoyant force calculator
Calculate ideal buoyant force from displaced-fluid volume and density.
On this page
Buoyant force490.33N
Equivalent supported mass50KG
Calculator controls
How to calculate
Calculate ideal buoyant force from displaced-fluid volume and density.
buoyant force = fluid density × displaced volume × gravity
Worked example
Fluid density (kg/m³): 1000; Displaced volume (m³): 0.05; Gravity (m/s²): 9.80665.
Buoyant force: 490.33 N; Equivalent supported mass: 50 kg.
Assumptions and limits
This is Archimedes’ ideal static force. Stability, shape, waves, trapped air, fluid motion, and object weight are separate.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Calculate ideal buoyant force from displaced-fluid volume and density. Every assumption remains visible so the result can be checked or changed.
When this tool is useful
Use the buoyant force for an initial estimate, comparison, or classroom calculation.
Understanding your inputs
| Input | What to enter |
|---|---|
| Fluid density (kg/m³) | Enter a number of at least 0 and no more than 1000000000000. |
| Displaced volume (m³) | Enter a number of at least 0 and no more than 1000000000000. |
| Gravity (m/s²) | Enter a number of at least 0 and no more than 1000000000000. |
Frequently asked questions
What are the limits of this buoyant force?
This is Archimedes’ ideal static force. Stability, shape, waves, trapped air, fluid motion, and object weight are separate.
Can I use different units?
Use the units printed beside each field. Convert measurements first when your source uses different units.