Convert Pound square inches to Pound square feet
Convert Pound square inches (lb·in²) to Pound square feet (lb·ft²) instantly and accurately.
Conversion Formula
lb·ft² = lb·in² × 0.006944444444
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 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.
Quick Reference Table
| Pound square inches (lb·in²) | Pound square feet (lb·ft²) |
|---|---|
| 1 lb·in² | 0.00694444 lb·ft² |
| 2 lb·in² | 0.0138889 lb·ft² |
| 5 lb·in² | 0.0347222 lb·ft² |
| 10 lb·in² | 0.0694444 lb·ft² |
| 25 lb·in² | 0.173611 lb·ft² |
| 50 lb·in² | 0.347222 lb·ft² |
| 100 lb·in² | 0.694444 lb·ft² |