- 1Enter the Mass of the object or material in kilograms (kg).
- 2Enter its Volume in cubic metres (m³). Volume must be greater than zero.
- 3Read the Calculated Density in kg/m³, with the g/cm³ (equal to g/mL) and lb/ft³ equivalents shown below.
The Density Calculator divides mass by volume to find how much matter is packed into a given space. Density tells you whether an object floats or sinks, helps identify materials, and is central to shipping and materials work. The tool takes SI inputs (kg and m³), reports the result in kg/m³, and also converts it to g/cm³ and lb/ft³. As a reference point, fresh water is about 1000 kg/m³, or 1.000 g/cm³.
The core calculation.
Density = Mass ÷ Volume (kg/m³ from kg and m³)g/cm³ is numerically the same as g/mL.
Density (g/cm³) = Density (kg/m³) ÷ 1000Imperial conversion applied to the result.
Density (lb/ft³) = Density (kg/m³) × 0.062428Density = 500 ÷ 0.25 = 2000 kg/m³ = 2.000 g/cm³ = 2000 × 0.062428 ≈ 124.86 lb/ft³Density = 1 ÷ 0.001 = 1000 kg/m³ = 1.000 g/cm³Density = 19.32 ÷ 0.001 = 19,320 kg/m³ = 19.320 g/cm³- Enter mass in kg and volume in m³ to get kg/m³. Remember 1 litre = 0.001 m³ and 1 cm³ = 0.000001 m³.
- Volume must be greater than zero, or the tool shows 'Volume must be greater than zero'. Mass cannot be negative.
- g/cm³ and g/mL are numerically identical. Water at about 1.000 g/cm³ is a convenient benchmark: denser materials sink in water, lighter ones float.
- The g/cm³ value is shown to three decimals and the kg/m³ and lb/ft³ values to two; small rounding differences between them are expected.
- Density assumes the material is uniform. For porous or mixed objects the result is the average (bulk) density.
How is density calculated?
Density = mass ÷ volume. With mass in kg and volume in m³, the result is in kg/m³.
Can density be expressed in g/cm³ and kg/m³?
Yes. They describe the same property; 1 g/cm³ = 1000 kg/m³. The calculator shows both, plus lb/ft³.
What is the density of water?
About 1000 kg/m³, or 1.000 g/cm³, at typical room conditions. It is the usual reference for whether something floats or sinks.
Why must volume be greater than zero?
Dividing mass by a volume of zero is undefined, so the calculator requires a positive volume.
How do I enter a volume given in litres or cm³?
Convert first: multiply litres by 0.001, or cubic centimetres by 0.000001, to get cubic metres.
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