Density Converter
Convert between kg/m³, g/cm³, lb/ft³, and more. Essential for materials science and engineering.
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Density = mass/volume. SI: kg/m³. Chemistry: g/cm³. US engineering: lb/ft³. Water = 1,000 kg/m³ (1 g/cm³) at 4°C — the reference point.
Specific Gravity
Ratio of density to water. Steel: SG ≈ 7.85 (7.85× denser than water). Simplifies engineering calculations.
Density in Materials Selection
Aluminium (2,700 kg/m³) ≈ 1/3 density of steel (7,850 kg/m³). Why it's preferred in aerospace.
How to Use This Calculator
- Select 'Density'
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- Select your source unit
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- Enter the value
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- Select your target unit
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Applications
Materials Engineering
0.1 m³ steel = 785 kg. Same volume aluminium = 270 kg.
Construction
Normal concrete: ~2,400 kg/m³. Lightweight: 1,600–1,900 kg/m³.
Oil and Gas
API gravity: light crude > 31.1° (< 870 kg/m³). Converting API to kg/m³ is standard in petroleum engineering.
Frequently Asked Questions
How do you convert kg/m³ to g/cm³?
Divide by 1,000. 2,700 kg/m³ = 2.7 g/cm³ (aluminium).
How do you convert g/cm³ to lb/ft³?
Multiply by 62.428. 7.85 g/cm³ (steel) = 490.1 lb/ft³.
Density of water?
1,000 kg/m³ or 1 g/cm³ at 4°C. The reference for specific gravity.