Archimedes principle states
Buoyant force acting on a body is equal to weight of the fluid displaced by the body.
According to Archimedes principle, the buoyant force acting on a body which is partially or fully immersed in a fluid, is equal to weight of the fluid displaced by the body.
Buoynat force, FB=ρVdispg
where Vdisp = Volume of fluid displaced by the body
ρ = Density of the fluid
g = Accelaration due to gravity