Ratio Calc‪!‬ 4+

Name: Ratio Calc!
Price: 2.99 USD
Rating: 4.5 (22 reviews)
Author: David Mills

Gearing for your R/C car

David Mills

Designed for iPad

- 4.5 • 22 Ratings

- $2.99
- Offers In-App Purchases

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

Jan 8, 2025

Version 7.4.1

-Improved the app layout when landscape on the largest phones

4.5 out of 5

22 Ratings

Nice

Great app for finding FDR. Has a bug on ipad at moment where I cannot hit "done", it does not appear on screen, after setting pinion and spur size, so cannot get out of this mode. Otherwise it does everything we need for finding gear ratios on our RC cars. Thanks for making this app. :-)

Best roll-out calc out there

Keep it up !!!!!! Your last updated totally made my day.

Thank you! 🙏

Perfect!

Well done! I love the amount of cars you have in the library. Great tool!

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.