Density g/cm³ ↔ kg/m³

1 g/cm³ = 1000 kg/m³. Water = 1 g/cm³ = 1000 kg/m³.

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About this calculator

1 g/cm³ = 1000 kg/m³ exactly. Water is conveniently 1 g/cm³ = 1000 kg/m³ at 4°C. Common materials: aluminum 2.7 g/cm³, iron 7.87, lead 11.34, gold 19.3, mercury 13.5. Air at sea level: 0.001225 g/cm³ = 1.225 kg/m³ (about 1/800 of water). Wood floats because density 0.4-0.7 g/cm³ < 1.

Frequently asked

Why 1 g/cm³ for water?+
Historical SI definition: 1 mL = 1 cm³ = 1 g of water at 4 °C. Original kg defined this way.
Common metals?+
Al 2.7, Fe 7.9, Cu 8.9, Pb 11.3, Au 19.3, Pt 21.5. Gold is one of densest non-uranium metals.
Air density variation?+
1.225 kg/m³ at sea level. Halves every ~5,500 m altitude. Cold air denser than hot.
Specific gravity?+
Density relative to water (dimensionless). SG of mercury = 13.5. SG of olive oil = 0.92.
Why two units?+
g/cm³ is convenient for benchtop chem. kg/m³ is SI standard for engineering.

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