Density Calculator

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Calculate density, mass or volume from the density formula ρ = m / V. Mix grams, kilograms or pounds with cm³, m³, liters or ft³, and read the result in every common unit.

g/cm³
m / V
Density –
In kg/m³ –
In g/cm³ –
In lb/ft³ –
Uses the density formula ρ = m / V. Inputs are converted to SI units (kg and m³) before computing, then the density is shown in kg/m³, g/cm³ and lb/ft³.

About Density Calculator

The density calculator solves any variable in the density formula ρ = m / V: enter mass and volume to get density, density and volume to get mass, or density and mass to get volume. Pick what to solve for and the form adapts to ask for the two knowns.

Units are flexible on purpose — mix grams, kilograms or pounds with cubic centimetres, cubic metres, liters or cubic feet. Inputs are converted to SI units before computing, and the density is then reported in kg/m³, g/cm³ and lb/ft³ simultaneously, so no follow-up conversion is needed.

It suits chemistry and physics homework, material identification (does this alloy match the density of aluminum?), shipping weight estimates and engineering checks. Free and instant, it removes the unit juggling that causes most density mistakes.

How to use Density Calculator

  1. Choose what to solve for: density, mass or volume.
  2. Enter the two known values, picking whatever units are convenient.
  3. Read the result — density is shown in kg/m³, g/cm³ and lb/ft³ at once.

Frequently asked questions

Density equals mass divided by volume: ρ = m / V. Rearranged, mass = density × volume and volume = mass ÷ density — this calculator solves whichever form you need.

Yes. Enter mass in pounds and volume in liters if you like — everything is converted to SI internally, and the answer appears in kg/m³, g/cm³ and lb/ft³ regardless of the inputs.

Multiply by 1,000: water’s 1 g/cm³ equals 1,000 kg/m³. The calculator displays both units side by side, so you rarely need to do this conversion by hand.

Weigh the object, measure its volume (water displacement works for irregular shapes), and compute the density. Comparing against reference values — aluminum ≈ 2,700 kg/m³, steel ≈ 7,850 — often narrows down what it is.

Real samples contain voids, impurities or alloys, and temperature changes density slightly. Small measurement errors in volume also amplify the result — measure volume as precisely as you can.
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