Density Converter — kg/m³, g/cm³, g/mL, lb/ft³
Convert density between kg/m³, g/cm³, g/mL, and lb/ft³ instantly.
Materials:
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Result
All Units
Common Material Densities
| Material | kg/m³ | g/cm³ |
|---|---|---|
| Air (at sea level) | 1.2 | 0.0012 |
| Water | 1,000 | 1.000 |
| Concrete | 2,300 | 2.300 |
| Aluminium | 2,700 | 2.700 |
| Iron / Steel | 7,874 | 7.874 |
| Copper | 8,960 | 8.960 |
| Lead | 11,340 | 11.34 |
| Gold | 19,300 | 19.30 |
Frequently Asked Questions
What is density?
Density is mass per unit volume (ρ = m/V). It tells you how much matter is packed into a given space. Water has a density of 1 g/cm³ or 1,000 kg/m³.
What are the most common density units?
kg/m³ is the SI unit. g/cm³ and g/mL are used in chemistry (they are equal: 1 g/cm³ = 1 g/mL = 1,000 kg/m³). lb/ft³ is used in the US construction industry.
What is the density of water?
Water at 4°C has a density of exactly 1 g/cm³ = 1 g/mL = 1,000 kg/m³ = 62.43 lb/ft³. This is used as a reference. Sea water is about 1,025 kg/m³.
What is the density of air?
Dry air at sea level and 20°C has a density of about 1.2 kg/m³ (0.075 lb/ft³). This is much less than water (1,000 kg/m³), which is why things float in air but not in water.
Why is density important in engineering?
Density determines buoyancy, structural loads, and material selection. Engineers must know if a material will float, how heavy a structure will be, and how it behaves under stress.