# GearCalc Pro — Gear Ratio Calc & 3D Sim

> Gear Ratio Calc & 3D Sim (iPhone/iPad app by Sui Fai Law.)

- Source: https://appshunter.io/ios/app/gearcalc-pro/id6767600060 (this page in markdown: same URL + `.md`)
- Developer: [Sui Fai Law](https://appshunter.io/developer/1889201616)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 8 MB
- Languages: American English
- Released: 2026-05-08
- Data updated: 2026-08-24
- User reviews in markdown: https://appshunter.io/ios/app/gearcalc-pro/id6767600060/reviews.md

## What is 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.


## Version history (last 2 releases)

### 1.1 — 2026-08-20

Improved banner layout and ad pacing. Stability improvements.

### 1.0 — 2026-05-09

No release notes.

## More apps by Sui Fai Law

- [Super Calc Pro+](https://appshunter.io/ios/app/super-calc-pro-plus/id6761375071)
- [LiDARVisionPro](https://appshunter.io/ios/app/lidarvisionpro/id6761379417)
- [3D Scan & Measure: Room Plan](https://appshunter.io/ios/app/3d-scan-and-measure-room-plan/id6761380782)
- [DriveLog Pro - 車輛智能管家](https://appshunter.io/ios/app/drivelog-pro/id6761730913)
- [Aura QR - Scanner & Generator](https://appshunter.io/ios/app/aura-qr-scanner-and-generator/id6761730939)
- [AetherChef](https://appshunter.io/ios/app/aetherchef/id6761731575)

All apps by Sui Fai Law: https://appshunter.io/developer/1889201616

## Related topics

[gear calculator pro](https://appshunter.io/ios/topics/gear-calculator-pro) · [gear ratio calculator lite](https://appshunter.io/ios/topics/gear-ratio-calculator-lite)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*