Density Converter
kg/m³, g/cm³ & lb/ft³
Why Density Units Matter
Density is simply a measure of how much "stuff" (Mass) is packed into a specific space (Volume). The formula is Mass ÷ Volume.
However, because different countries use different units for Mass (kg vs. lbs) and Volume (liters vs. gallons), we end up with dozens of confusing density units.
The "Water Standard" (g/cm³)
The metric system was designed around water. At 4°C (39°F), water has a density of exactly 1 g/cm³ (or 1,000 kg/m³).
This makes g/cm³ the most intuitive unit to use:
- < 1.0: The object floats in water (e.g., Oil, Wood, Ice).
- > 1.0: The object sinks in water (e.g., Aluminum, Steel, Gold).
Did you know? Ice is one of the only solids in the universe that is LESS dense than its liquid form. Water expands when it freezes, which is why ice cubes float in your drink.
Common Materials Cheat Sheet
| Material | Density (g/cm³) | Density (lb/ft³) |
|---|---|---|
| Air | 0.0012 | 0.075 |
| Pine Wood | 0.65 | 40.6 |
| Water | 1.00 | 62.4 |
| Concrete | 2.40 | 150.0 |
| Steel | 7.85 | 490.0 |
| Gold | 19.30 | 1,206.0 |