Density tells you how much mass is packed into a given volume. Enter any two of density, mass and volume to calculate the third.
Formula
rho = m / V
Where rho is the density (kg/m³), m is the mass (kg), V is the volume (m³).
Choose any value to calculate — the calculator rearranges the formula for you.
Worked example
5 kg of water fills 0.005 m³ (5 litres), so its density is 5 ÷ 0.005 = 1,000 kg/m³, or 1 g/cm³.
Typical densities
Air ≈ 1.2 kg/m³ · Water ≈ 1,000 kg/m³ · Aluminium ≈ 2,700 kg/m³ · Steel ≈ 7,850 kg/m³ · Gold ≈ 19,300 kg/m³.
Frequently asked questions
What is the formula for density?
Density = mass ÷ volume, written ρ = m / V.
How do I convert kg/m³ to g/cm³?
Divide by 1,000. Water at 1,000 kg/m³ is 1 g/cm³.
Last updated · Calculations checked by automated tests· Editorial policy