GearCalc Pro
Gear Ratio Calc & 3D Sim
Free · Designed for iPad. Not verified for macOS.
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.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
Improved banner layout and ad pacing. Stability improvements.
The developer, Sui Fai Law, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Sui Fai Law
- Size
- 8 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © (C) 2026 Neuralworks