kN/m³ to kg/m³ Conversion

1 kN/m³ equals about

101,97 kg/m³

From Specific Weight to Density

The kilonewton per cubic meter (kN/m³) is a unit of specific weight, not density: it measures a force (weight, due to gravity) per unit of volume, not a mass. To get density (mass per unit of volume) from specific weight, you need to divide by the standard acceleration of gravity (9.80665 m/s²), the same way mass is calculated from weight according to Newton's second law.

The Conversion Formula

To convert from kN/m³ to kg/m³, multiply by 1,000 (to get N/m³) and divide by 9.80665:

To convert from kg/m³ to kN/m³, perform the inverse operation:

Practical Examples

• 9.81 kN/m³ ≈ 1,000 kg/m³ (specific weight and density of water)
• 18 kN/m³ ≈ 1,835 kg/m³ (typical specific weight of sandy soil)
• 24 kN/m³ ≈ 2,447 kg/m³ (typical specific weight of concrete)
• 77 kN/m³ ≈ 7,852 kg/m³ (typical specific weight of steel)

When This Conversion Is Needed

This conversion is essential in civil and geotechnical engineering, where the properties of soils and construction materials are often given as specific weight (kN/m³, useful for calculating thrusts and loads), but need to be converted to density (kg/m³) for other types of calculations, such as estimating the total mass of a volume of material.

Other Density Conversions

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