Density is a fundamental physical property defined as mass per unit volume. In engineering and material science, two of the most common units used to quantify this property are the gram per cubic centimeter (g/cm³) and the pound per cubic foot (lb/ft³).
Gram per cubic centimeter (g/cm³): This is the standard metric unit for density, often used in laboratory settings and scientific research. It is equivalent to the density of water at 4°C, which is approximately 1 g/cm³.
Pound per cubic foot (lb/ft³): This is a common Imperial unit used extensively in the United States construction, civil engineering, and HVAC industries to describe the density of materials like concrete, soil, and insulation.
To convert between these systems, we use the relationship where \(1 \text{ g/cm}^3 \approx 62.428 \text{ lb/ft}^3\). This conversion is essential when translating international material specifications into local building codes.
Gram per cubic centimeter to Pound per cubic foot Conversion Reference Table
Gram per cubic centimeter (g/cm³)
Pound per cubic foot (lb/ft³)
0.1
6.2428
0.5
31.214
1.0
62.428
2.0
124.8559
5.0
312.1398
10.0
624.2796
20.0
1248.5592
50.0
3121.3981
100.0
6242.7962
500.0
31213.981
1000.0
62427.962
Step-by-Step Conversion Example
To convert a density value from g/cm³ to lb/ft³, multiply the given value by the conversion factor of 62.427962033560895.
The factor is derived from the ratio of the mass of one pound (453.592 grams) to the volume of one cubic foot (28,316.8 cubic centimeters). Dividing these constants yields the conversion factor used to bridge the metric and imperial systems.
Use g/cm³ for scientific calculations, chemistry, and international engineering projects. Use lb/ft³ when working with US-based construction materials, structural load calculations, or legacy industrial equipment specifications.
"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)