Convert Ounce square inches to Gram square millimetres
Convert Ounce square inches (oz·in²) to Gram square millimetres (g·mm²) instantly and accurately.
Conversion Formula
g·mm² = oz·in² × 18289.97834
About Ounce square inches
The ounce square inch (oz·in²) equals ≈1.829 × 10⁻⁵ kg·m², used in US precision instrument engineering for light rotating components. Pre-metric American gyroscope gimbal assemblies and US MIL-SPEC instrument servo actuators cited inertia in oz·in²; NACA gyroscope test reports use oz·in² for small rotating elements. 1 oz·in² ≈1.829 × 10⁻⁵ kg·m² = 16 oz·in² per lb·in².
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
| Ounce square inches (oz·in²) | Gram square millimetres (g·mm²) |
|---|---|
| 1 oz·in² | 18290 g·mm² |
| 2 oz·in² | 36580 g·mm² |
| 5 oz·in² | 91449.9 g·mm² |
| 10 oz·in² | 182900 g·mm² |
| 25 oz·in² | 457249 g·mm² |
| 50 oz·in² | 914499 g·mm² |
| 100 oz·in² | 1829000 g·mm² |