Convert Pound square inches to Slug square feet
Convert Pound square inches (lb·in²) to Slug square feet (slug·ft²) instantly and accurately.
Conversion Formula
slug·ft² = lb·in² × 0.0002158399317
About Pound square inches
The pound square inch (lb·in²) equals ≈2.926 × 10⁻⁴ kg·m², the standard US customary unit for motor and machinery rotors. Rockwell Automation, Parker Hannifin, and Allied Motion servo sizing catalogs express rotor inertia in lb·in²; US machine-tool spindle and conveyor drive specifications use lb·in². High-speed spindle rotors: 5-50 lb·in². 1 lb·in² ≈2.926 × 10⁻⁴ kg·m² = 1/144 lb·ft².
About Slug square feet
The slug square foot (slug·ft²) equals ≈1.3558 kg·m², the fundamental moment of inertia unit in US customary aerodynamics and spacecraft attitude dynamics. Pre-SI spacecraft inertia tensors are tabulated in slug·ft² - NASA Apollo CSM principal moments ranged 12 000-90 000 slug·ft². USAF flight manuals and NACA stability reports use slug·ft². 1 slug·ft² ≈1.3558 kg·m² = 32.174 lb·ft².
Quick Reference Table
| Pound square inches (lb·in²) | Slug square feet (slug·ft²) |
|---|---|
| 1 lb·in² | 0.00021584 slug·ft² |
| 2 lb·in² | 0.00043168 slug·ft² |
| 5 lb·in² | 0.0010792 slug·ft² |
| 10 lb·in² | 0.0021584 slug·ft² |
| 25 lb·in² | 0.005396 slug·ft² |
| 50 lb·in² | 0.010792 slug·ft² |
| 100 lb·in² | 0.021584 slug·ft² |