Density Calculator

Density is mass divided by volume: 1 kg of water filling 0.001 m³ — one litre — gives 1000 kg/m³. Enter kilograms and cubic metres and the answer comes out in kg/m³. Anything lighter than 1000 kg/m³ floats on water, anything heavier sinks. Divide by 1000 for g/cm³.

Density is mass divided by volume — how much matter is packed into each cubic metre. It is what separates a feather from a brick of the same size, and for a given material at a given temperature it is fixed, which is why it works as a fingerprint. Enter kilograms and cubic metres and the answer comes back in kg/m³. One kilogram of water filling a one-litre bottle is 1 ÷ 0.001 = 1000 kg/m³, which is also exactly 1 g/cm³, the unit chemistry usually prefers. The same number answers three different questions. Buoyancy: water sits at about 1000 kg/m³, so anything below that floats and anything above sinks — ice at 917 kg/m³ floats, which is why icebergs show above the sea, while aluminium at 2700, iron at 7870 and gold at 19,300 kg/m³ go straight down. Identity: a metal sample landing near 2700 kg/m³ is far more likely aluminium than steel. Logistics: because density links mass to volume, either one gives you the other. Two caveats are worth keeping. Density shifts with temperature and pressure, so published figures always state a temperature. And what you get here is an average — a porous, hollow or mixed object returns a blended value, not the density of the solid material.