Convert Pound square feet to Gram square millimetres
Convert Pound square feet (lb·ft²) to Gram square millimetres (g·mm²) instantly and accurately.
Conversion Formula
g·mm² = lb·ft² × 42140110.09
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 Gram square millimetres
The gram square millimetre (g·mm²) equals 10⁻⁹ kg·m², the natural unit for MEMS gyroscope resonators and micro-fabricated spinning structures. CubeSat reaction wheel rotors range 1-50 g·mm²; chip-scale IMU proof masses sit below 1 g·mm². Watchmaking balance wheels and miniature turbine blades also fall in this range. 1 g·mm² = 10⁻⁹ kg·m² = 0.01 g·cm².
Quick Reference Table
| Pound square feet (lb·ft²) | Gram square millimetres (g·mm²) |
|---|---|
| 1 lb·ft² | 42140100 g·mm² |
| 2 lb·ft² | 84280200 g·mm² |
| 5 lb·ft² | 210701000 g·mm² |
| 10 lb·ft² | 421401000 g·mm² |
| 25 lb·ft² | 1.054 × 109 g·mm² |
| 50 lb·ft² | 2.107 × 109 g·mm² |
| 100 lb·ft² | 4.214 × 109 g·mm² |