Density Converter
Convert between g/cm³, kg/m³, lb/in³, and lb/ft³ in real time, with density values for common materials built in.
Convert density between metric and US units — g/cm³, kg/m³, lb/in³, and lb/ft³ — all at once as you type. Built-in presets for gold, iron, copper, water, ice, and air let you pull up a known density instantly and compare materials side by side, whether you're doing engineering math, a chemistry assignment, or a shop calculation.
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How to use
- Type a value into any of the density fields.
- Every other unit — g/cm³, kg/m³, lb/in³, lb/ft³ — converts at the same time.
- Tap a material reference button to load that substance's density and see it converted across all units.
FAQ
- How many kg/m³ is 1 g/cm³?
- Exactly 1,000 kg/m³. That also happens to be the density of pure water at 4°C, which is why it's such a common reference point.
- How do lb/in³ and lb/ft³ relate?
- 1 lb/in³ equals 1,728 lb/ft³ — there are 1,728 cubic inches in a cubic foot. That works out to roughly 27.68 g/cm³, which is an extremely high density.
- Are the density values for each material always exact?
- The presets for gold, iron, water, and so on are reference values at room temperature and standard atmospheric pressure. Real-world density shifts slightly with temperature, pressure, purity, or alloy composition, so for precision industrial work you should double-check against measured figures for your specific material.