Buoyancy Calculator

Calculate buoyant force, weight, and whether an object floats or sinks using Archimedes' principle.

Fluid Density (kg/m³)

Water: 1000, Seawater: 1025, Oil: ~850

Object Density (kg/m³)

Wood: ~500, Steel: 7800, Ice: 917

Volume Input

Object Volume (m³)

Result

Floats ✓

50.0% submerged

Buoyant Force (F_b = ρ_fluid × g × V)4,905 N

Object Weight (W = ρ_obj × g × V)2,452.5 N

Net Force (F_b − W)+2,452.5 N

Displaced Volume0.5 m³

Archimedes' Principle: F_b = ρ_fluid × g × V_displaced. An object floats when its average density is less than the fluid's density.