Convert Pounds per cubic inch to Pounds per cubic foot
Convert Pounds per cubic inch (lb/in³) to Pounds per cubic foot (lb/ft³) instantly and accurately.
Conversion Formula
lb/ft³ = lb/in³ × 1728
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.
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.
Quick Reference Table
| Pounds per cubic inch (lb/in³) | Pounds per cubic foot (lb/ft³) |
|---|---|
| 1 lb/in³ | 1728 lb/ft³ |
| 2 lb/in³ | 3456 lb/ft³ |
| 5 lb/in³ | 8640 lb/ft³ |
| 10 lb/in³ | 17280 lb/ft³ |
| 25 lb/in³ | 43200 lb/ft³ |
| 50 lb/in³ | 86400 lb/ft³ |
| 100 lb/in³ | 172800 lb/ft³ |