Science
Buoyant Force Calculator
Use the buoyant force calculator for Archimedes' principle problems involving displaced fluid volume.
Choose the missing quantity; the calculator hides that field and solves it from the others.
Solved value
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- Buoyant force
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- Fluid density
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- Displaced volume
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- Gravity
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Student quick launch
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Study path
Use this calculator with
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What the buoyant force calculator solves
Use the buoyant force calculator for Archimedes' principle problems involving displaced fluid volume.
Formula
How to use it
- Choose the quantity you want to solve for.
- Enter the known values with consistent units.
- Check the rearranged formula, substitution, and warnings before using the result.
How to read the answer
The upward buoyant force equals the weight of the displaced fluid in this ideal model.
Common mistakes and edge cases
- Use displaced fluid volume, not necessarily the object's full volume.
- Use the fluid density, not the object density.
- This model does not decide whether the object floats unless you compare buoyant force with weight.
Worked examples
Solve the main formula
Solved value
Buoyant force = 98 N
Reverse-solve one factor
Solved value
Fluid density = 500 kg/m^3
Frequently asked questions
Can the buoyant force calculator solve for a missing variable?+
Yes. Use the solve-for control to hide the missing value, then enter the other known values with compatible units.
Why do the units matter?+
Formula calculators assume the entered values are already in matching units. Convert first when your measurements use mixed systems.
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Last updated: May 15, 2026