Density Converter

Divide kg/m³ by 1000. Example: 7850 kg/m³ ÷ 1000 = 7.85 g/cm³. To reverse, multiply g/cm³ by 1000. This is the most common conversion in materials science.

Multiply kg/m³ by 0.0624279. Example: 1000 kg/m³ × 0.0624279 = 62.43 lb/ft³. To reverse, divide lb/ft³ by 0.0624279. Common in US construction and engineering specs.

Water density at 4°C is 1000 kg/m³ (1 g/cm³ = 62.43 lb/ft³) — its maximum density, used as the reference point for specific gravity. Every other substance's specific gravity is its density divided by this value.

Specific gravity is the ratio of a substance's density to water's density at 4°C — a dimensionless number. Gold has a specific gravity of about 19.3 (19.3 times denser than water); materials with specific gravity below 1, like most plastics, float.

The unit conversion factors (kg/m³, g/cm³, lb/ft³, etc.) are exact by mathematical definition. The material reference densities (aluminum, steel, etc.) are typical published values — real density varies with temperature, purity, and composition, so treat them as reference figures, not lab measurements.