Density Calculator
Density is mass divided by volume. You get kg/m³, g/cm³, and lb/ft³. This is informational. Density equals specific gravity only when you compare to water at a stated temperature.
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How to calculate density
- Enter mass and pick kg, g, lb, or oz.
- Enter volume and pick m³, L, mL, cm³, ft³, or in³.
- Read kg/m³, g/cm³, and lb/ft³ from mass over volume.
- Do not call the result specific gravity unless you divide by water density. Nothing is uploaded.
Mass density
Mass divided by volume
| Formula | density = mass / volume |
|---|---|
| SI | kg/m³ |
| cgs | g/cm³ = kg/m³ / 1000 |
| US customary | lb/ft³ from kg/m³ × 0.0624279606 |
| Mass units | kg, g, lb, oz |
| Specific gravity | Density relative to water. Not reported unless you supply that reference. |
How density is computed
Mass converts to kilograms. Volume converts to cubic meters. Density is kg divided by m³. g/cm³ is that value over 1000. lb/ft³ uses 0.0624279606 times kg/m³.
Density versus specific gravity
Density has units. Specific gravity is a ratio to a reference, usually water. This page does not assume 1000 kg/m³ unless you do that division yourself. Convert mass on the mass converter and volume on the volume converter.
Use cases
A lab block, a packed sample, or a tank inventory when you already measured mass and volume. Buoyancy and compressibility are not modeled. Floor area jobs sit on square footage.
Limits
Mass and volume must be greater than 0. Temperature and pressure are not inputs. Informational only. CZNull does not receive the numbers.