Free Density Calculator — Find Density, Mass or Volume Using ρ = m ÷ V

Calculate density from mass and volume, find mass from density and volume, or find volume from mass and density.

Density Calculator

Mass (kg)

Volume (m³)

How to Use

Choose the mode based on what you want to find. Find Density: enter mass (kg) and volume (m³) to get density in kg/m³. Find Mass: enter density and volume to get mass in kg. Find Volume: enter mass and density to get volume in m³. All values use SI units (kg and m³). For other units, convert first using the Mass & Weight converter.

Worked Examples

Water

Mass1 kg

Volume0.001 m³

Density = 1,000 kg/m³

Aluminium

Density2,700 kg/m³

Volume0.01 m³

Mass = 27 kg

Iron block

Mass158 kg

Density7,874 kg/m³

Volume = 0.02 m³

Frequently Asked Questions

Density is mass per unit volume: ρ = m ÷ V. It tells you how much matter is packed into a given space. Water has a density of 1,000 kg/m³; iron is about 7,874 kg/m³; air is approximately 1.225 kg/m³.

ρ (density) = m (mass) ÷ V (volume). Rearranged: m = ρ × V, and V = m ÷ ρ. This triangle — ρ = m/V — is one of the most fundamental formulas in physics and chemistry.

Pure water at 4°C has a density of exactly 1,000 kg/m³ (1 g/cm³ or 1 kg/litre). This is the reference point for specific gravity: materials denser than 1,000 kg/m³ sink in water; less dense materials float.

Multiply by 1,000. A density of 1 g/cm³ = 1,000 kg/m³. This is because 1 m³ = 1,000,000 cm³ and 1 kg = 1,000 g, giving a conversion factor of 1,000.

Free Density Calculator — Find Density, Mass or Volume Using ρ = m ÷ V

Density Calculator

How to Use

Worked Examples

Frequently Asked Questions

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