RC Rollout Calculator
Gear Ratio & Pinion Finder
Free · Designed for iPad. Not verified for macOS.
RC Rollout Calculator is the essential tool for every RC car enthusiast. Quickly calculate the perfect rollout, find the right pinion gear, and fine-tune your gear ratio — all in one app.
Features:
• Rollout Calculator: Select spur gear, pinion gear, and tire diameter to instantly calculate your rollout value.
• Pinion Finder: Enter your desired rollout, spur gear, and tire diameter to find the matching pinion gear.
• Interactive Tables: View rollout values across different spur/pinion and tire/pinion combinations at a glance.
• Highlighted Selection: Your current setup is highlighted in the table so you can easily compare nearby gear combinations.
• Two Table Modes: Switch between Spur/Pinion and Tire/Pinion tables to explore different setups.
• Portrait & Landscape: Fully optimized for both orientations — compact pickers in portrait, side-by-side layout in landscape.
• No Ads, No Subscription: A simple, focused tool that just works.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, VOLKER JOOSS, 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 Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- VOLKER JOOSS
- Size
- 9.5 MB
- Category
- Utilities
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
- English and German
- Age Rating
4+
- 4+
- Copyright
- © Volker Jooss 2026