Convert Pound square feet to Slug square inches
Convert Pound square feet (lb·ft²) to Slug square inches (slug·in²) instantly and accurately.
Conversion Formula
slug·in² = lb·ft² × 4.475656825
About Pound square feet
The pound square foot (lb·ft²) equals ≈0.04214 kg·m², the dominant imperial unit for machine and vehicle rotational inertias. Aircraft control-surface counterbalancing, propeller blade inertia, and turbocharger rotor dynamics are specified in lb·ft²; steam turbine discs and helicopter tail-rotor assemblies: 1-10 000 lb·ft². 1 lb·ft² ≈0.04214 kg·m² = 144 lb·in² ≈0.03108 slug·ft².
About Slug square inches
The slug square inch (slug·in²) equals ≈9.415 × 10⁻³ kg·m², used in US aerospace guidance and flight mechanics. Pre-metric inertial navigation unit (INU) test reports and NACA stability-derivative tables listed gyroscope platform inertia in slug·in²; US autopilot servo actuator sizing also uses slug·in². 1 slug·in² ≈9.415 × 10⁻³ kg·m² ≈32.17 lb·in².
Quick Reference Table
| Pound square feet (lb·ft²) | Slug square inches (slug·in²) |
|---|---|
| 1 lb·ft² | 4.47566 slug·in² |
| 2 lb·ft² | 8.95131 slug·in² |
| 5 lb·ft² | 22.3783 slug·in² |
| 10 lb·ft² | 44.7566 slug·in² |
| 25 lb·ft² | 111.891 slug·in² |
| 50 lb·ft² | 223.783 slug·in² |
| 100 lb·ft² | 447.566 slug·in² |