Density Converter
Convert between metric and imperial density units instantly. Type any value to update all fields simultaneously.
Common Material Densities & Conversions
| Material | kg/m³ | g/cm³ | lb/ft³ |
|---|---|---|---|
| Water (4°C) | 1,000 | 1.000 | 62.43 |
| Air (15°C, sea level) | 1.225 | 0.001225 | 0.0765 |
| Aluminium | 2,700 | 2.70 | 168.6 |
| Steel | 7,850 | 7.85 | 490.0 |
| Concrete | 2,400 | 2.40 | 149.8 |
| Oak wood | 720 | 0.72 | 44.96 |
| Gold | 19,320 | 19.32 | 1,206 |
What is the density of water in kg/m³?
Pure water at 4°C has a density of exactly 1,000 kg/m³ — equivalent to 1 g/cm³ or 1 g/mL. At room temperature (20°C) water is very slightly less dense at approximately 998.2 kg/m³. Sea water averages around 1,025 kg/m³ due to dissolved salts.
How do I convert g/cm³ to kg/m³?
To convert g/cm³ to kg/m³, multiply by 1,000. So iron at 7.874 g/cm³ = 7,874 kg/m³. This works because 1 cm³ = 0.000001 m³, and 1 g = 0.001 kg — the factors of 1,000 cancel to give ×1,000 overall.
How do I convert lb/ft³ to kg/m³?
Multiply lb/ft³ by 16.0185 to get kg/m³. Concrete at 150 lb/ft³ ≈ 2,403 kg/m³. To go the other way, multiply kg/m³ by 0.0624 to get lb/ft³.
Why are g/cm³, g/mL and kg/L all the same?
Because 1 cm³ = 1 mL exactly, and 1 L = 1,000 mL = 1,000 cm³ = 1 kg/L when comparing to kg. So 1 g/cm³ = 1 g/mL = 1 kg/L = 1,000 kg/m³. These are three notations for the same density — the choice of notation depends on context (chemistry vs. engineering vs. logistics).