Density is the mass per unit volume of a substance, symbolised by rho. The formula is rho = m/V, where m is mass and V is volume.

What units does density use?

Common units include kg/m³ (SI), g/cm³, and g/mL. Water has a density of about 1000 kg/m³ or 1 g/cm³.

What determines whether an object floats?

An object floats if its density is less than the density of the fluid it is in. For example, wood (about 500 kg/m³) floats on water (1000 kg/m³).

How are density and specific gravity related?

Specific gravity is the ratio of a substance's density to the density of water. It is dimensionless. A specific gravity greater than 1 means the substance sinks in water.

Does temperature affect density?

Yes. Most substances expand when heated, decreasing their density. Water is unusual: it is densest at 4°C. Gases are particularly sensitive to temperature changes.

SCIScience

Density Calculator

Calculate density, mass, or volume using the density formula rho = m/V. Given any two values, compute the third instantly.

Solve for

Mass (m)

Volume (V)

m³

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How It Works

Formula

\rho = \frac{m}{V}

V = \frac{m}{\rho}

m = \rho \cdot V

Where

$\rho$: Density(kg/m³)
$m$: Mass(kg)
$V$: Volume(m³)

Choose what to solve for: density (given mass and volume), volume (given mass and density), or mass (given volume and density). Enter the two known values and the calculator computes the third.

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