kg/m³ · g/cm³ · lb/ft³ · lb/in³
Free Density Converter
Convert density units instantly — kg/m³, g/cm³, g/mL, lb/ft³, lb/in³, slug/ft³, and more. Free, symmetrical, no sign-up.
Why symmetrical conversion?
How This Converter Works
Density is critical in materials science, chemistry, and engineering. SI uses kg/m³, chemistry uses g/cm³ or g/mL, and US engineering uses lb/ft³. Our converter handles 11 density units simultaneously.
Quick reference
Common Conversions
| Material | kg/m³ | g/cm³ | lb/ft³ |
|---|---|---|---|
| Air (at 20°C) | 1.204 kg/m³ | 0.001204 g/cm³ | 0.0752 lb/ft³ |
| Water (at 4°C) | 1,000 kg/m³ | 1.0 g/cm³ | 62.43 lb/ft³ |
| Concrete | 2,400 kg/m³ | 2.4 g/cm³ | 149.8 lb/ft³ |
| Aluminium | 2,700 kg/m³ | 2.7 g/cm³ | 168.6 lb/ft³ |
| Steel | 7,850 kg/m³ | 7.85 g/cm³ | 490 lb/ft³ |
| Gold | 19,300 kg/m³ | 19.3 g/cm³ | 1,205 lb/ft³ |
FAQ
Frequently Asked Questions
1How do I convert g/cm³ to kg/m³?
Multiply by 1,000. So 2.7 g/cm³ = 2,700 kg/m³. This is because 1 cm³ = 0.000001 m³, and 1 g = 0.001 kg.
2What is the density of water?
Water has a maximum density of 1.0 g/cm³ (1,000 kg/m³) at 4°C. At higher temperatures it is slightly less dense. Sea water is denser at about 1.025 g/cm³.
3What is specific gravity?
Specific gravity is the ratio of a material's density to the density of water. Pure water has a specific gravity of 1.0. Materials denser than water (SG > 1) sink; lighter materials float.
4Why is density important in engineering?
Density determines structural weight, buoyancy, and material selection. Engineers balance high-density materials like steel (strong, heavy) against low-density alternatives like aluminium (lighter, still strong).
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