Kilogram per cubic metre

The kilogram per cubic metre (symbol: kg·m−3, or kg/m3) is the unit of density in the International System of Units (SI), defined by mass in kilograms divided by volume in cubic metres.[1]

Kilogram per cubic metre
Density of the cube: 1 kg/m3
General information
Unit systemSI
Unit ofDensity
Symbolkg/m3
Conversions
1 kg/m3 in ...... is equal to ...
   Imperial and US Customary units   0.06242796 lb/cu ft
   CGS units   0.001 g/cm3
   MTS units   0.001 t/m3

Conversions
  • 1 kg/m3 = 1 g/L (exactly)[2]
  • 1 kg/m3 = 0.001 g/cm3 (exactly)[3]
  • 1 kg/m3 ≈ 0.06243 lb/ft3 (approximately)
  • 1 kg/m3 ≈ 0.1335 oz/US gal (approximately)
  • 1 kg/m3 ≈ 0.1604 oz/imp gal (approximately)


  • 1 g/cm3 = 1000 kg/m3 (exactly)
  • 1 lb/ft3 ≈ 16.02 kg/m3 (approximately)
  • 1 oz/(US gal) ≈ 7.489 kg/m3 (approximately)
  • 1 oz/(imp gal) ≈ 6.236 kg/m3 (approximately)

Relation to other measures

The density of water is about 1000 kg/m3 or 1 g/cm3, because the size of the gram was originally based on the mass of a cubic centimetre of water.

In chemistry, g/cm3 is more commonly used.

See also

References
  1. International Bureau of Weights and Measures (2006), The International System of Units (SI) (PDF) (8th ed.), ISBN 92-822-2213-6, archived (PDF) from the original on 2021-06-04, retrieved 2021-12-16
  2. "1 gram per liter in kg/m^3". Wolfram Alpha. Retrieved 31 March 2022.
  3. "Kilogram per cubic meter". UnitsCounter.com. Retrieved 2021-12-11.
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