Density Calculator

Choose what to solve for, enter two values, and click Calculate

Density: 8,900 kg/m³

Density: 8,900 kg/m³
Mass: 8,900 kg
Volume: 1 m³

Density equals mass divided by volume. Weight is the force of gravity on a mass, W = m × g, and is reported in newtons. The mass converter treats the input as a mass, even when the word weight is used in everyday language.

What this calculator does

The Density Calculator applies the density equation, ρ = m ÷ V, in three directions: find density from mass and volume, find volume from mass and density, or find mass from density and volume. Because inputs can use different systems, it converts mass and volume to kilograms and cubic meters, calculates, and expresses the answer in your chosen output unit.

Density describes how much mass is packed into a given volume. It is useful for identifying materials, estimating shipping weight, checking whether an object will float, and converting between mass and volume. Air is about 1.2 kg/m³, water about 1,000 kg/m³, and metals several thousand kg/m³.

How to use this calculator

Choose what you want to solve for: density, volume, or mass.
Enter the two known quantities. Select the matching unit for each.
Choose the unit in which the answer should be displayed.
Click Calculate.

The default density example uses 8,900 kilograms and 1 cubic meter, giving 8,900 kg/m³, close to the density of copper. Volume mode uses the same mass and density and returns 1 cubic meter. Mass mode uses 8,900 kg/m³ and 1 cubic meter and returns 8,900 kilograms, followed by equivalent masses in other units.

Formulas

The density equation can be rearranged for each mode:

Density: ρ = m ÷ V
Volume:  V = m ÷ ρ
Mass:    m = ρ × V

Mass is converted to kilograms, volume to cubic meters, and density to kilograms per cubic meter before the calculation. The displayed answer is then converted to the selected output unit. These conversions use fixed factors, such as 1 liter = 0.001 cubic meters and 1 pound = 0.45359237 kilograms.

What the results mean

The headline result is the value you chose to solve for, in the selected unit. The summary rows also show mass in kilograms, volume in cubic meters, and density in kilograms per cubic meter. In mass mode, a table lists the same mass in kilograms, grams, milligrams, metric tons, pounds, ounces, carats, atomic mass units, grains, quarters, and stones.

High density means a large mass is packed into a small volume. Density is not weight: weight depends on gravity, while density depends only on mass and volume.

Assumptions and limitations

Density is treated as constant. In reality it changes with temperature and pressure, especially for gases.
Zero mass, density, or volume is allowed where the formula permits it, but a zero divisor is rejected. Volume mode requires density above zero.
The unit lists cover common metric, US, and UK units. The US and UK gallons differ and are labeled separately.
The mass table uses defined factors such as the exact international pound. Results are rounded for display.
The calculator does not identify a material from its density; many materials share similar values.
For porous, granular, or mixed materials, bulk density may differ from solid density.

Frequently asked questions

How do I calculate density?

Divide mass by volume. For example, if a block has a mass of 2,000 kilograms and a volume of 0.25 cubic meters, its density is 2,000 ÷ 0.25 = 8,000 kg/m³.

Why is density usually measured in kg/m³?

The SI mass unit is the kilogram and the volume unit is the cubic meter, so the coherent density unit is kg/m³. Laboratories often use g/cm³ or g/mL, which are numerically equal.

Does density change with temperature?

Yes, especially for gases. Heating a substance usually increases its volume, which lowers its density if the mass stays constant. Water is unusual because its density increases between 0°C and about 4°C before decreasing at higher temperatures.

Reference tables

Density units

Unit	kg/m³
Kilogram per cubic meter (kg/m³)	1
Gram per cubic centimeter (g/cm³)	1,000
Gram per milliliter (g/mL)	1,000
Pound per cubic foot (lb/ft³)	16.018463
Pound per cubic inch (lb/in³)	27,679.905

Typical material densities

Values are approximate and rounded. Actual density varies with temperature, pressure, purity, moisture, and for bulk materials, packing.

Material	Density in kg/m³	lb/ft³
Air (20 °C)	1.2	0.075
Pine wood	500	31
Oak wood	700	44
Ethanol	789	49
Gasoline	720	45
Ice	917	57
Water (4 °C)	1,000	62
Seawater	1,025	64
Milk	1,030	64
Concrete	2,400	150
Glass	2,500	156
Aluminum	2,700	169
Steel	7,850	490
Copper	8,960	559
Lead	11,340	708
Mercury	13,534	845
Gold	19,320	1,206

Source

Reference: Calculator.net — Density Calculator. Unit definitions follow international standards; density values for common materials can be verified in reference tables from NIST or engineering handbooks.

Disclaimer

This calculator provides general density estimates from the values you enter. Material properties can vary by composition, temperature, porosity, and measurement method, so verify critical values against a trusted reference.

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