Enter your cube's side length and mass to calculate its density using the formula ρ = m/V. The Cube Density Calculator automatically computes the volume from the side length, then divides mass by volume to give you density in kg/m³ along with the total volume in m³. You can also switch between common mass and length units to match your measurements. Also try the Bending Stress Calculator.
Density
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Volume (m³)
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Mass (kg)
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Density Unit
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The density formula is ρ = m / V, where ρ is density, m is mass, and V is volume. For a cube, volume is calculated as V = side³ (side length cubed). So the full formula becomes ρ = m / side³. See also our Beam Deflection Calculator.
The volume of a cube is found by cubing the length of one side: V = a³, where 'a' is the side length. For example, a cube with a side of 0.1 m has a volume of 0.001 m³. Make sure your side length and mass units are consistent before dividing.
Measure the side length of the concrete cube and weigh it accurately. Then use the formula ρ = m / a³. A standard concrete cube (150 mm side) typically weighs around 7.5–8 kg, giving a density of approximately 2200–2400 kg/m³. Enter these values into the calculator to get the precise result.
Measure the side length of the sugar cube (typically around 1 cm) and weigh it (roughly 4–5 g). Plug these values into the formula ρ = m / a³. The typical density of a sugar cube is around 1500–1600 kg/m³, though it can vary based on compression and moisture. You might also find our calculate Elongation Percentage, Change in Length (ΔL) & Engineering Strain (ε) — Elongation useful.
Measure one side of the wooden cube carefully with a ruler, then place it on a scale to get the mass. Enter both values into the calculator along with your preferred units. Wood densities vary widely — balsa is around 120 kg/m³ while oak can be around 700 kg/m³.
Set side length to 2 ft and mass to 5 lb in the calculator. The volume = 2³ = 8 ft³. After converting to SI units, the density comes out to approximately 10.02 kg/m³ (or about 0.625 lb/ft³). The calculator handles unit conversions for you automatically.
This calculator is specifically designed for cube-shaped objects where all sides are equal. For rectangular boxes or other shapes, a different volume formula would be needed. If you know the exact volume of your object, you can still use density = mass / volume directly.
Density depends on how tightly packed the molecules of a material are. Temperature causes materials to expand or contract, changing the volume and thus the density. Pressure compresses materials, increasing density. For solids like concrete or wood, these effects are small, but they're significant for gases and liquids.