# 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.