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Archimedes Upthrust Ratio to Object Weight Calculator

Fraction of object weight supported by buoyancy in a fluid.

Computes the buoyancy force F_b = ρ_fluid · V_submerged · g, the upthrust ratio F_b / (m·g), and whether the object floats or sinks based on density comparison.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

kg/m³
kg/m³
m³

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

F_b = ρ_f · V · g; ratio = ρ_f / ρ_obj

In depth

Computes the buoyancy force F_b = ρ_fluid · V_submerged · g, the upthrust ratio F_b / (m·g), and whether the object floats or sinks based on density comparison.