Conversion Formula
$$\rho_{\text{lb/ft³}} = SG \times 62.428$$
Multiply specific gravity by 62.428 to get lb/ft³.
SG to lb/ft³ Conversion Table
| Specific Gravity (SG) | Pound per Cubic Foot (lb/ft³) |
|---|---|
| 0.1 | 6.2428 |
| 0.5 | 31.214 |
| 1 | 62.428 |
| 2 | 124.856 |
| 5 | 312.14 |
| 10 | 624.28 |
| 25 | 1,560.7 |
| 50 | 3,121.4 |
| 100 | 6,242.8 |
| 250 | 15,607 |
| 500 | 31,214 |
| 1,000 | 62,428 |
SG to lb/ft³ in Engineering
Density conversions are critical for fluid mechanics, material selection, concrete mix design, and petroleum engineering. Specific gravity (relative to water at 4°C) is commonly used as a dimensionless density ratio across all disciplines.
Specific Gravity: Dimensionless ratio of density to water at 4°C (1000 kg/m³). SG = 1.0 for water. Universal engineering reference.
Pound per Cubic Foot: Primary US density unit. Water = 62.4 lb/ft³. Used for soil, concrete, aggregate, and material densities.