GearCalc Pro

GearCalc Pro is the most professional gear ratio calculator and 3D simulator for hobbyists, makers, and engineers working with motorized projects.

WHAT IT DOES
- Calculate exact gear ratios for any motor + target speed/torque
- Auto-suggest optimal gear teeth combinations across 1-6 stages
- Real-time 3D visualization of compound gear trains with proper meshing
- Simulate gear rotation at adjustable input RPM with live output display
- Battery life estimation across 11 battery types
- Reverse motor finder - given target RPM/torque, find the best motor

MOTOR LIBRARY (18 models)
- Ultra Micro: N10
- Micro: N20, N30, GA12-N20 gearmotor
- Small: TT, DC 130/FA-130, DC 180, DC 260, DC 280
- Medium: DC 380, RS-540, RS-545, RS-550
- Large: RS-775, RS-895
- BLDC: 2208 drone motor
- Stepper: NEMA 14, NEMA 17, NEMA 23
- Servo: SG90, MG996R
- Custom motor input - add your own specs

ENGINEERING FEATURES
- Standard gear theory: D = teeth x module
- Per-stage efficiency (Spur, Helical, Worm, Bevel, Planetary)
- Gear pair recommendations from 21 standard tooth counts (8T to 120T)
- Worm gear support with 1/2/4-start configurations
- Standard ISO modules (0.3 to 4.0)
- Motor dimension diagrams with shaft, bore, and mounting specs
- Save/load configurations

3D VISUALIZATION
- Real PBR-rendered gears with metallic shading
- Color-coded stage badges
- Auto-fit camera, free 3D rotation
- Reset view to recenter
- Start/stop animation with physics-correct rotation

8 LANGUAGES
Traditional Chinese, English, Simplified Chinese, Japanese, Korean, Spanish, French, German.

EXPORT
- Generate spec sheet image
- Copy text spec to clipboard
- Share via standard iOS share sheet

Whether you're designing a robot, toy, RC car, 3D printer, or CNC machine, GearCalc Pro gives you the math, the visualization, and the engineering data in one beautifully designed app.