Gear Formula: Calc & Simulator
Gear Ratio, RPM & Torque Tools
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Visual gear ratio, RPM, torque, and drivetrain simulation for bicycles, robotics, RC cars, gearboxes, and engineering learning.
Gear Formula: Calc & Simulator is a visual gear calculator and simulator for real-world transmission planning, learning, and quick design exploration.
Built for bicycle riders, RC car builders, robotics teams, automotive tinkerers, mechanical engineering learners, DIY gearbox makers, and education use cases, the app helps you understand how gear choices affect ratio, speed, torque, and motion.
What you can do:
- Explore different gear families with clear visual selection flows.
- Calculate gear ratio, RPM change, torque change, and drivetrain behavior.
- Edit transmission values and see the simulator update in real time.
- Compare how tooth counts and key parameters change the result.
- Use guided validation feedback to review whether a setup looks balanced or too extreme.
- Save and revisit useful configurations with Pro features.
- Share saved configurations through app links with Pro features.
Supported gear families in the current app:
- Chain and sprocket
- Spur gear pair
- Planetary gear set
- Bevel gear pair
- Worm drive
- Rack and pinion
- Compound train
Designed for multiple audiences:
- Bicycle
- RC Car
- Robotics
- Automotive
- Mechanical Engineering
- DIY Gearbox
- Education
Why Gear Formula is useful:
- It is faster than doing repeated ratio math by hand.
- It makes gear behavior easier to understand visually.
- It helps users move from “What does this gear setup do?” to “Is this setup good for my goal?”
- It works well for quick mobile checking, concept exploration, and learning.
Important:
Gear Formula is a reference and educational tool. Calculations, simulations, and validation guidance are not a substitute for professional engineering review, safety testing, or manufacturing verification.
Free and Pro:
The free version supports core calculation and simulation.
Pro unlocks advanced workflow features such as Save, Share, Bookmark, and Validate, and also removes ads.
Whether you are tuning cadence, exploring gearbox reduction, teaching gear fundamentals, or testing drivetrain ideas on the go, Gear Formula gives you a practical mobile workspace for gear calculation and simulation!
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Le Minh Tran, 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 Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Le Minh Tran
- Size
- 36.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 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
- In-App Purchases
Yes
- Unlock Pro Features $2.99
- Remove Ads $1.99
- Copyright
- © 2026 Tran Le Minh