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Density Calculator

Density, mass or volume, solving for whichever is missing.

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Common material densities

Often the fastest way to identify an unknown sample.

Materialg/cm³kg/m³lb/ft³

Density

—

In other units

g/cm³—
kg/m³—
lb/ft³—
Specific gravity—

—

Behaviour in water at 1.000 g/cm³

Density is mass per unit volume, so an object floats when it is less dense than the fluid around it. Water is 1 g/cm³ at 4 °C, which is the reference specific gravity is built on. Temperature changes density slightly, and gas densities depend heavily on pressure.

Quick Tool Overview

The Density Calculator solves the mass, volume and density relationship in any direction, converting units freely so grams with millilitres and pounds with cubic feet both work. Specific gravity against water and a material reference table come with it.

What it does
Solves for density, mass or volume from the other two
You give it
Any two of the three, in any units
You get back
The third value, plus specific gravity
Best for
Physics and chemistry problems, and identifying materials
Calculators Free, unlimited use No sign-up Runs in your browser

About the Density Calculator

Solve the density relationship in any direction: give any two of density, mass and volume and the third is calculated. Units are converted for you, so grams with millilitres and pounds with cubic feet both work without hand conversion.

Density is mass per unit volume, and it is what determines whether something floats: an object less dense than the fluid around it displaces its own weight before it is fully submerged. Water at 1 g/cm³ is the convenient reference the whole idea of specific gravity is built on, and that ratio is reported alongside the result. A table of common materials is included, which is often the fastest way to identify an unknown sample.

Key features of the Density Calculator

Solves in any direction

Density, mass or volume — whichever you leave out is the one calculated.

Mixed units accepted

Each value carries its own unit, so no hand conversion before entry.

Specific gravity

The ratio against water, which is the quick test for whether something will float.

Material reference table

Common metals, liquids, woods and gases, often the fastest way to identify an unknown sample.

Results in several units

kg/m³, g/cm³ and lb/ft³ at once, since different fields prefer different ones.

How to use the Density Calculator

  1. 1

    Choose what to solve for

    Density, mass or volume — whichever you do not know.

  2. 2

    Enter the other two

    Pick units independently for each; conversion is handled.

  3. 3

    Read the answer

    The missing value in several units, plus specific gravity against water.

  4. 4

    Compare to the table

    Common material densities are listed, which helps identify an unknown sample.

Frequently asked questions

Density equals mass divided by volume: ρ = m / V. Rearranged, mass is density times volume, and volume is mass divided by density.

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