Convert Pounds per cubic foot to Pounds per cubic inch
Convert Pounds per cubic foot (lb/ft³) to Pounds per cubic inch (lb/in³) instantly and accurately.
Conversion Formula
lb/in³ = lb/ft³ × 0.0005787037037
About Pounds per cubic foot
The pound per cubic foot (lb/ft³) equals ≈16.018 kg/m³, widely used in US construction, soil mechanics, and insulation specifications. Softwood framing lumber averages 25-35 lb/ft³; compacted soil 90-130 lb/ft³; fresh water ≈62.43 lb/ft³; concrete 145-150 lb/ft³. ASTM standards for concrete, soil, and geotextiles routinely cite lb/ft³. 1 lb/ft³ = 0.45359237/0.028316846592 kg/m³ ≈16.018 kg/m³.
About Pounds per cubic inch
The pound per cubic inch (lb/in³) equals ≈27 679.9 kg/m³, the standard US customary unit for engineering material density. Mechanical engineering handbooks list metals in lb/in³: steel 0.284, aluminium 0.098, copper 0.324, tungsten 0.697, lead 0.410. FEA software (ANSYS, Nastran) configured with US unit sets reads material density as lb/in³. 1 lb/in³ = 1728 lb/ft³ = 16 oz/in³ ≈27 679.9 kg/m³.
Quick Reference Table
| Pounds per cubic foot (lb/ft³) | Pounds per cubic inch (lb/in³) |
|---|---|
| 1 lb/ft³ | 0.000578704 lb/in³ |
| 2 lb/ft³ | 0.00115741 lb/in³ |
| 5 lb/ft³ | 0.00289352 lb/in³ |
| 10 lb/ft³ | 0.00578704 lb/in³ |
| 25 lb/ft³ | 0.0144676 lb/in³ |
| 50 lb/ft³ | 0.0289352 lb/in³ |
| 100 lb/ft³ | 0.0578704 lb/in³ |