Ad Space — Top Banner

Buoyancy Calculator

Calculate buoyant force and whether an object will float or sink.
Enter object volume, object density, and fluid density.

Buoyancy Result

Archimedes’ Principle: An object submerged in fluid experiences an upward buoyant force equal to the weight of fluid displaced.

Buoyant Force = ρ_fluid × V × g

Where:

  • ρ_fluid = fluid density
  • V = volume of object submerged
  • g = gravitational acceleration (9.81 m/s²)

Will it float?

  • Object density < fluid density → Floats (net upward force)
  • Object density = fluid density → Neutrally buoyant
  • Object density > fluid density → Sinks (net downward force)

Percent submerged (if floating): % Submerged = (ρ_object / ρ_fluid) × 100

Common fluid densities (kg/m³):

Fluid Density
Fresh water 1,000
Salt water 1,025
Mercury 13,600
Oil (cooking) 920

Common object densities (kg/m³):

Material Density
Ice 917
Wood (oak) 600–900
Steel 7,850
Aluminum 2,700
Human body ~1,010

Ad Space — Bottom Banner

Embed This Calculator

Copy the code below and paste it into your website or blog.
The calculator will work directly on your page.