Density Calculator
Solve density, mass or volume using density = mass ÷ volume.
1 cm³ equals 1 ml. Water is about 1 g/cm³ (1,000 kg/m³) — the dividing line between floating and sinking.
Mass packed into space
Density measures how concentrated matter is — the mass contained in a unit of volume. It explains why a small lead ball feels heavy while a big foam block feels like nothing at all.
density = mass ÷ volume · mass = density × volume · volume = mass ÷ density
Because the three quantities are tied by one equation, knowing any two gives the third. Pick what you want to find and the calculator rearranges the formula for you.
100 g occupying 50 cm³ has a density of 2 g/cm³ — that is 2,000 kg/m³, twice the density of water, so it would sink.
Density in the world
Density decides what floats, helps identify materials, and matters everywhere from ship design to cooking. Comparing a material’s density to water’s — its specific gravity — is a quick way to predict whether it will sink or swim.
Worth remembering
- Water ≈ 1 g/cm³. The handy reference point for floating.
- 1 cm³ = 1 ml. Volume in cooking and chemistry lines up neatly.
- ×1,000 for SI. g/cm³ to kg/m³ is just a factor of a thousand.