Ratio Calc! 4+
Gearing for your R/C car
David Mills
Designed for iPad
-
- Free
- Offers In-App Purchases
Screenshots
Description
Ratio Calc is a quick and easy tool for radio control car racers to use trackside. Knowing your final drive ratio (FDR) is very useful for comparison with other racers to determine if your car is geared correctly.
It lets you quickly select your car by filtering on manufacturer and model. Select your pinion and spur size and the FDR is displayed. Tyre diameter can also be entered to calculate your rollout.
Ratio and roll out charts are also available which plot pinion and spur gear combinations to create very handy reference tables.
- Save your favourite cars for quick access
- Select measurement units (imperial/metric)
- Select your preferred gear pitch, alternative ratios in other pitches will be shown
- Over 2000 cars/variants in the database which is updated regularly
What’s New
Version 7.5
-Improved search results now show the correct number of results
-Updated for iOS 26
-Latest version of the car database
App Privacy
The developer, David Mills, 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.
Privacy practices may vary based on, for example, the features you use or your age. Learn More
Information
- Provider
- David Mills
- Size
- 35.8 MB
- Category
- Sports
- Compatibility
-
- iPhone
- Requires iOS 16.6 or later.
- iPad
- Requires iPadOS 16.6 or later.
- Mac
- Requires macOS 13.5 or later and a Mac with Apple M1 chip or later.
- Apple Vision
- Requires visionOS 1.0 or later.
- Languages
-
English, German, Italian, Spanish
- Age Rating
- Learn More
- Copyright
- © 2011-2025 David Mills
- Price
- Free
- In-App Purchases
-
- Insane Tip USD 11.99
- Mega Tip USD 5.99
- Generous Tip USD 3.99
- Nice Tip USD 0.99