GearCalc Pro

Engineering-grade gear ratio calculator with real-time 3D simulation, 18 motors, 8 languages.

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.