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Density Calculator

Find density as mass divided by volume.

How it is calculated

Density is mass per unit of volume: ρ = m / V. The tool does no unit conversion: the result is in whatever mass unit you typed divided by whatever volume unit you typed. Grams with cubic centimetres give g/cm³, kilograms with cubic metres give kg/m³, and the two scales differ by a factor of 1,000 (1 g/cm³ = 1,000 kg/m³). Keep both inputs in matching units from the same system. The volume must be greater than zero, otherwise nothing is returned; the result is rounded to two decimals. Mass should be the amount of material itself, and volume the space it actually occupies, so for a hollow or porous object you obtain a bulk density, not that of the pure material.

Worked example

A metal block has a mass of 540 g and occupies a volume of 200 cm³. Divide the mass by the volume: 540 / 200 = 2.7. The density is 2.70 g/cm³, which is the commonly quoted value for aluminium. In SI units the same block would be 2,700 kg/m³. If the same 540 g object had a volume of 540 cm³, the density would be 1.00 g/cm³, about that of water.

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Common mistakes

  • Mixing units, such as mass in kilograms with volume in cubic centimetres, which gives a number that matches neither kg/m³ nor g/cm³.
  • Entering the dimension (length in cm) instead of the volume in cm³, or forgetting that a litre is 1,000 cm³.
  • Using weight in newtons or pounds-force in place of mass.
  • Measuring the volume of a hollow object by its outer size and treating the result as the density of the material.

About this calculator

This calculator applies the basic physics formula density = mass / volume (ρ = m/V), typically expressed in kg/m³ or g/cm³, to tell you how tightly matter is packed into a given space.

Chemistry and physics students use it to identify unknown materials by comparing a measured density against known reference values (water is 1 g/cm³, aluminum around 2.7 g/cm³), while engineers and shipping companies use it to check whether an object will float, estimate the weight of a shipment from its volume, or verify material purity. The calculator works with any consistent mass and volume units you enter, so it handles both a small lab sample and a bulk cargo container the same way.

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Comments (1)

  • Editorial team

    The tool divides and never converts, so the unit of the answer is your mass unit over your volume unit. Grams and cubic centimetres give g/cm³, where water is about 1; kilograms and cubic metres give kg/m³, where water is about 1000. If you expect a metal near 8 and see 8000, you mixed unit systems. Comparing the result with a known material is the quickest check. What material are you trying to identify?

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