Density Calculator (ρ = m/V)
Calculate density, mass or volume using ρ = m/V. Enter any two of density, mass and volume to find the third. Includes specific gravity vs water.
How to use this tool
- Enter mass, volume and density (if known) in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your density and the full breakdown beneath it.
Density is mass per unit volume: ρ = m/V. The SI unit is kg/m³. Specific gravity is the ratio of a substance's density to that of water (1000 kg/m³ at 4°C). Objects with SG < 1 float in water.
Frequently asked questions
- What is the density of common materials?
- Water: 1000 kg/m³, aluminium: ~2700, steel: ~7800–8000, gold: ~19,300, air: ~1.2 kg/m³ at sea level.
- How do I convert g/cm³ to kg/m³?
- Multiply by 1000. So 2.7 g/cm³ (aluminium) = 2700 kg/m³.