Find a material's density from mass and volume
Weigh it, measure it, divide. The calculator also runs backwards — how much does 2 L of mercury weigh?
Tools used in this guide
The job
Density = mass ÷ volume. Lab write-ups, shipping weight estimates, and 'is this really gold' checks all reduce to filling two of the three fields and solving the third.
Two in, one out
Enter mass and volume to get density; density and volume to get mass; mass and density to get volume. Pick units per field — the tool converts internally to kg and m³.
- Water ≈ 1,000 kg/m³ (1 g/cm³); aluminium ≈ 2,700; lead ≈ 11,340.
- Fill exactly two fields — three filled means nothing to solve.
Worked example
A 540 g rock displacing 200 mL has density 2.7 g/cm³ — aluminium or granite territory, not lead. Going the other way: 2 L of mercury at 13,534 kg/m³ masses about 27 kg — heavier than it looks.
Where it stops
Homogeneous density only — hollow objects and alloys get an average, not the truth. Precision is limited by your measurements; the math is exact, the scale and the displacement cup are not.