Kilogram per cubic metre

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

Kilogram per cubic metre
Density - Kilogram per cubic metre.svg
Density of the cube: 1 kg/m3
General information
Unit systemSI derived unit
Unit ofDensity
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


1 kg/m3 is equivalent to:

= 0.001 g/cm3 (exactly)
≈ 0.06243 lb/ft3 (approximately)
≈ 0.1335 oz/gal[clarification needed] (approximately)

1 g/cm3 = 1000 kg/m3 = 1,000,000 g/m3 (exactly)

1 lb/ft3 ≈ 16.02 kg/m3 (approximately)

1 oz/gal[clarification needed] ≈ 7.489 kg/m3 (approximately)

Relation to other measuresEdit

The kilogram was originally based on the mass of one litre of water, thus the density of water is about 1000 kg/m3 or 1 g/cm3. In chemistry, g/cm3 is more commonly used.

See alsoEdit


  1. ^ International Bureau of Weights and Measures (2006), The International System of Units (SI) (PDF) (8th ed.), ISBN 92-822-2213-6, archived from the original (PDF) on 2017-08-14

External linksEdit