Convert Gram square millimetres to Pound square inches
Convert Gram square millimetres (g·mm²) to Pound square inches (lb·in²) instantly and accurately.
Conversion Formula
lb·in² = g·mm² × 3.417171898e-6
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.
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.
Quick Reference Table
| Gram square millimetres (g·mm²) | Pound square inches (lb·in²) |
|---|---|
| 1 g·mm² | 3.417 × 10-6 lb·in² |
| 2 g·mm² | 6.834 × 10-6 lb·in² |
| 5 g·mm² | 1.709 × 10-5 lb·in² |
| 10 g·mm² | 3.417 × 10-5 lb·in² |
| 25 g·mm² | 8.543 × 10-5 lb·in² |
| 50 g·mm² | 0.000170859 lb·in² |
| 100 g·mm² | 0.000341717 lb·in² |