Density is a fundamental physical property defined as mass per unit volume. In engineering and scientific applications, two primary systems of measurement are frequently encountered: the International System of Units (SI) and the Imperial/US Customary system.
Kilogram per cubic meter (kg/m³): The SI derived unit for density. It is the standard for global scientific research, chemical engineering, and international trade.
Pound per cubic foot (lb/ft³): A common unit in the United States, widely used in civil engineering, construction, and the oil and gas industry to describe the density of materials like concrete, soil, and drilling fluids.
To convert between these units, we utilize the relationship where \(1 \text{ kg/m}^3 \approx 0.062428 \text{ lb/ft}^3\). This conversion is essential when reconciling international material specifications with local construction standards.
Kilogram per cubic meter to Pound per cubic foot Conversion Reference Table
Kilogram per cubic meter (kg/m³)
Pound per cubic foot (lb/ft³)
0.1
0.0062
0.5
0.0312
1.0
0.0624
2.0
0.1249
5.0
0.3121
10.0
0.6243
20.0
1.2486
50.0
3.1214
100.0
6.2428
500.0
31.214
1000.0
62.428
Conversion Example: 10 kg/m³ to lb/ft³
To convert a density value from kg/m³ to lb/ft³, multiply the value by the conversion factor of 0.062427962033560894.
The factor is derived from the conversion of mass (1 kg = 2.20462 lb) divided by the conversion of volume (1 m³ = 35.3147 ft³). Dividing 2.20462 by 35.3147 yields the constant 0.062428.
The lb/ft³ unit is standard in the US construction industry for concrete density, the HVAC industry for airflow calculations, and the petroleum industry for drilling mud weight.
"On fait la science avec des faits, comme on fait une maison avec des pierres ; mais une accumulation de faits n'est pas plus une science qu'un tas de pierres n'est une maison." "Science is built up of facts, as a house is built of stones; but an accumulation of facts is no more a science than a heap of stones is a house." — Henri Poincaré (French Mathematician, Theoretical Physicist & Mining Engineer)