Density Calculator

Solve for

Material

Mass, kg

Volume, m³

Density, kg/m³

Result

Result1,000
What was calculatedDensity, kg/m³
Density, g/cm³1
In waterthe same density as water
Relative to water1
Materiala custom value

One formula in three shapes

Finds any of density, mass or volume from the other two, with a table of densities for common materials.

Density is mass over volume, and all three formulas fall out of that single definition. The practical value lies elsewhere: to find a mass you need not measure a volume at all — knowing the material is enough.

Hence the table: a cubic metre of water weighs a tonne, concrete 2.4 tonnes, steel almost eight. The ratio to water answers whether something floats: anything under a thousand kilograms per cubic metre stays on the surface.

What this calculator shows

Density, mass or volume from the other two
Density in grams per cubic centimetre and relative to water
Whether the material floats or sinks

What to keep in mind

Densities are quoted at room temperature; for gases and liquids they depend noticeably on temperature and pressure.
Granular materials also have a bulk density, lower than the substance's own because of the voids between grains.

FAQs

How do I find density?

Divide mass by volume. Kilograms per cubic metre is the SI unit, but everyday use prefers grams per cubic centimetre, which is the same number divided by a thousand.

How much does a cubic metre of concrete weigh?

About 2,400 kg for ordinary dense concrete. Lightweight grades on expanded clay run 1,000 to 1,800 kg per cubic metre.

Why does ice float?

Ice is 917 kg/m³ against water's 1,000. Water is one of the rare substances that expands on freezing, which is exactly why lakes do not freeze solid.

What is relative density?

The ratio of a substance's density to water's. It comes out dimensionless and matches the density in grams per cubic centimetre.

Worked example

A cubic metre of steel

Input: Steel, volume 1 m³

Output: 7,850 kg at 7.85 g/cm³

Note: Nearly eight tonnes to the cubic metre — which is where the rule comes from that a steel bar of one square decimetre in section weighs 78.5 kg per metre. Aluminium of the same shape weighs a third of that.

Useful links

All tools in Math & Statistics

Density Calculator

Result

Related tools

Ideal Gas Law Calculator

Force, Work and Power Calculator

Weight Converter

Useful links