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Density Calculator

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

kg
m³
Examples

Density = 7874 / 1 = 7874 kg/m³

Density
7,874 kg/m³

Denser than water (1000 kg/m³) — this object would sink.

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Examples

How It Works

Formula

ρ=mV\rho = \frac{m}{V}

V=mρV = \frac{m}{\rho}

m=ρ⋅Vm = \rho \cdot V

Variables

ρ\rho

Density(kg/m³)

mm

Mass(kg)

VV

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.

Density (rho) is mass per unit volume. The calculator picks the algebraic form that matches your two known inputs and returns the missing quantity. For density mode it divides mass by volume; for volume mode it divides mass by density; for mass mode it multiplies volume by density. Stay in consistent SI units (kg and m³) to read the result in kg/m³.

Frequently Asked Questions

01What is density?
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.
02What 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.
03What 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).
04How should I use reference density values?
Use density values reported for the material and conditions you care about, then enter the value in consistent units.
05Do conditions affect density values?
Published density values depend on the conditions they were measured at. This calculator does not apply temperature or pressure corrections, so use a value appropriate to your case.

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