UnitSnapDensity converter
Density is mass per unit volume. The SI unit is the kilogram per cubic meter (kg/m³). Grams per cubic centimeter are common in chemistry and materials science, where 1 g/cm³ equals exactly 1,000 kg/m³. Pure water has a density close to 1 g/cm³ near 4 °C, which makes it a convenient reference.
Convert between 6 density units. Pick any two units below; results update as you type.
Popular density conversions
About density units
US engineering often uses pounds per cubic foot or pounds per cubic inch, and liquids such as fuel are sometimes described in pounds per gallon. Because the US and imperial gallons differ, lb/gal values depend on which gallon is meant.
Specific gravity, the ratio of a substance's density to that of water, is numerically almost the same as density in g/cm³. Density changes with temperature, and for gases also with pressure.
Tips
- Quote the temperature with density values for liquids and gases, since both expand when heated.
- Water is about 62.4 lb/ft³, a useful benchmark for checking customary-unit density figures.
- Confirm US or imperial gallons when working with lb/gal values for fuels or chemicals.
All density units
| Unit | Symbol | Value in grams per cubic centimeter |
|---|---|---|
| Grams per Cubic Centimeter | g/cm³ | 1 g/cm³ = 1 g/cm³ |
| Kilograms per Cubic Meter | kg/m³ | 1 kg/m³ = 0.001 g/cm³ |
| Pounds per Cubic Inch | lb/in³ | 1 lb/in³ = 27.6799 g/cm³ |
| Pounds per Cubic Foot | lb/ft³ | 1 lb/ft³ = 0.01601846 g/cm³ |
| Pounds per Imperial Gallon | lb/gal (UK) | 1 lb/gal (UK) = 0.09977637 g/cm³ |
| Pounds per US Gallon | lb/gal | 1 lb/gal = 0.1198264 g/cm³ |
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Factors: NIST SP 811 · SI Brochure · NIST Handbook 44 — Updated