Ratio Calc!7.6 - App Store
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Publisher 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
Version History -Updated for the latest devices
-Refreshed database
-Fixed a few small bugs 7.6 5d ago -Car search now works by manufacturer name as well
-Fixed some manufacturer logo display issues
-Improved the database update process
-Some updated manufacturer logos
-Fixed an issue with Zen Racing no longer showing 7.5.1 11/11/2025 -Improved search results now show the correct number of results
-Updated for iOS 26
-Latest version of the car database 7.5 09/22/2025 -Improved the app layout when landscape on the largest phones 7.4.1 01/08/2025 -Fixed an issue with the charts disappearing for saved cars - thanks Ali!
-Pull to refresh on the Manufacturers list now updates the car database 7.4 12/11/2024 -You can now save cars, with notes etc
-Saved cars can now be amended 7.3 12/07/2024 -Improved data entry for pinion, spur and tyre diameters to allow faster calculations
-Historic saved cars can now have their gear, spur, pitch and diameters adjusted for calculations, however changes will not yet be saved 7.2 12/03/2024 -Improved charts
-Updated database 7.1 11/28/2024 Ratio Calc is back, modernised, and free. Please consider leaving a tip.
-Easily searchable cars list
-Quickly mark your favourite cars
-Dark mode
-Dark mode app icons
-Transponder widget 7.0 11/25/2024 -Support for the latest devices and iOS
-Improved the database update process to show more details
-Removed the text erasing buttons on the text fields when editing notes
-Moved the gear and diameter pickers up so that the results can be seen whilst changing the settings
-Updated database and manufacturers
-Various other little tweaks and improvements
Enjoy your R/C racing! 6.6 02/23/2019 We've added a tip jar - the app has been kept up to date since 2011 and we've never charged for an update. Any tip will unlock the ability to change the app's colour scheme and app icon - we've even included some retro icons that may be familiar to long time users.
Also in this version:
-Improved watch app reliability
-Transponder input form improvements
-Other boring little fixes and optimisations 6.5 01/23/2018 -iPhone X support
-Improved Apple Watch app (watchOS 2+ required)
-Now you can save motor and timing details for your saved cars
-Improved displays when using larger display fonts 6.4 01/08/2018 - Change of support email address
Enjoy your racing! 6.3.1 01/26/2017 -You can now update the car database more easily
-iOS10 compatibility
-Latest car database included 6.3 11/11/2016 -Improved car database updating - simply pull to refresh on the manufacturers screen
-Quickly copy your transponder number into the clipboard
-Fixed an issue with the ruler displaying incorrectly
-Improved iPad Pro support 6.2 05/14/2016 - Transponder store improvements - you can now save more than 3 transponder numbers - thanks to Jason H for the suggestion.
****Note:**** Please ensure you visit the transponder store part of the app to migrate your existing transponder numbers over to the new version. Until this is done they will not show in the Today widget or on the Apple Watch Glance.
- iPad multitasking support for iO9
- Revised app layouts - faster navigation using tabs
- Several other tweaks and improvements 6.1 11/03/2015 -Database update URL has now changed. This version is required to continue receiving car database updates.
-Fixed a bug which hid the car notes under the keyboard if the note was more than a few lines long. Thanks Michael T for reporting this. 6.0.1 10/06/2015 Introducing Ratio Calc! for Apple Watch - view your cars ratio/rollout with ease.
Now you can store your transponder numbers so that they're available quickly when booking in - view them either on the Apple Watch or on the Today screen (iOS8 required).
If you love using Ratio Calc! please leave a review - it's greatly appreciated. Many thanks. 6.0 05/28/2015 -Updated for iOS8, iPhone 6, iPhone 6+
-Latest car database
-iOS7 is now a minimum requirement
-Bug fixes 5.10 01/26/2015 -Quick access chart buttons for saved cars now display correct pinion/spur info 5.03 06/05/2014 More iOS7 bugfixes - sorry :-( 5.02 04/02/2014 -Bug fixes (iOS 7.x)
-Latest database
-Performance improvements 5.01 03/28/2014 -New look and layout
-Requires iOS6 and above
-84 DP, Mod 0.4, Mod 0.6 pitch support 5.0 02/19/2014 *Bug fixes
*latest database and logos 4.80 10/28/2013 -iPad support!
-Latest database 4.70 03/25/2013
About Ratio Calc!
The company that develops Ratio Calc! is David Mills. The latest version released by its developer is 7.6.
To install Ratio Calc! on your iOS device, just click the green Continue To App button above to start the installation process. The app is listed on our website since 2026-10-14 and was downloaded 0 times. We have already checked if the download link is safe, however for your own protection we recommend that you scan the downloaded app with your antivirus. Your antivirus may detect the Ratio Calc! as malware if the download link is broken.
How to install Ratio Calc! on your iOS device:
- Click on the Continue To App button on our website. This will redirect you to the App Store.
- Once the Ratio Calc! is shown in the iTunes listing of your iOS device, you can start its download and installation. Tap on the GET button to the right of the app to start downloading it.
- If you are not logged-in the iOS appstore app, you'll be prompted for your your Apple ID and/or password.
- After Ratio Calc! is downloaded, you'll see an INSTALL button to the right. Tap on it to start the actual installation of the iOS app.
- Once installation is finished you can tap on the OPEN button to start it. Its icon will also be added to your device home screen.
Program Details
System requirements
Download information
Pricing
Version History
version 7.6
posted on 2026-10-14
Version History -Updated for the latest devices
-Refreshed database
-Fixed a few small bugs 7.6 5d ago -Car search now works by manufacturer name as well
-Fixed some manufacturer logo display issues
-Improved the database update process
-Some updated manufacturer logos
-Fixed an issue with Zen Racing no longer showing 7.5.1 11/11/2025 -Improved search results now show the correct number of results
-Updated for iOS 26
-Latest version of the car database 7.5 09/22/2025 -Improved the app layout when landscape on the largest phones 7.4.1 01/08/2025 -Fixed an issue with the charts disappearing for saved cars - thanks Ali!
-Pull to refresh on the Manufacturers list now updates the car database 7.4 12/11/2024 -You can now save cars, with notes etc
-Saved cars can now be amended 7.3 12/07/2024 -Improved data entry for pinion, spur and tyre diameters to allow faster calculations
-Historic saved cars can now have their gear, spur, pitch and diameters adjusted for calculations, however changes will not yet be saved 7.2 12/03/2024 -Improved charts
-Updated database 7.1 11/28/2024 Ratio Calc is back, modernised, and free. Please consider leaving a tip.
-Easily searchable cars list
-Quickly mark your favourite cars
-Dark mode
-Dark mode app icons
-Transponder widget 7.0 11/25/2024 -Support for the latest devices and iOS
-Improved the database update process to show more details
-Removed the text erasing buttons on the text fields when editing notes
-Moved the gear and diameter pickers up so that the results can be seen whilst changing the settings
-Updated database and manufacturers
-Various other little tweaks and improvements
Enjoy your R/C racing! 6.6 02/23/2019 We've added a tip jar - the app has been kept up to date since 2011 and we've never charged for an update. Any tip will unlock the ability to change the app's colour scheme and app icon - we've even included some retro icons that may be familiar to long time users.
Also in this version:
-Improved watch app reliability
-Transponder input form improvements
-Other boring little fixes and optimisations 6.5 01/23/2018 -iPhone X support
-Improved Apple Watch app (watchOS 2+ required)
-Now you can save motor and timing details for your saved cars
-Improved displays when using larger display fonts 6.4 01/08/2018 - Change of support email address
Enjoy your racing! 6.3.1 01/26/2017 -You can now update the car database more easily
-iOS10 compatibility
-Latest car database included 6.3 11/11/2016 -Improved car database updating - simply pull to refresh on the manufacturers screen
-Quickly copy your transponder number into the clipboard
-Fixed an issue with the ruler displaying incorrectly
-Improved iPad Pro support 6.2 05/14/2016 - Transponder store improvements - you can now save more than 3 transponder numbers - thanks to Jason H for the suggestion.
****Note:**** Please ensure you visit the transponder store part of the app to migrate your existing transponder numbers over to the new version. Until this is done they will not show in the Today widget or on the Apple Watch Glance.
- iPad multitasking support for iO9
- Revised app layouts - faster navigation using tabs
- Several other tweaks and improvements 6.1 11/03/2015 -Database update URL has now changed. This version is required to continue receiving car database updates.
-Fixed a bug which hid the car notes under the keyboard if the note was more than a few lines long. Thanks Michael T for reporting this. 6.0.1 10/06/2015 Introducing Ratio Calc! for Apple Watch - view your cars ratio/rollout with ease.
Now you can store your transponder numbers so that they're available quickly when booking in - view them either on the Apple Watch or on the Today screen (iOS8 required).
If you love using Ratio Calc! please leave a review - it's greatly appreciated. Many thanks. 6.0 05/28/2015 -Updated for iOS8, iPhone 6, iPhone 6+
-Latest car database
-iOS7 is now a minimum requirement
-Bug fixes 5.10 01/26/2015 -Quick access chart buttons for saved cars now display correct pinion/spur info 5.03 06/05/2014 More iOS7 bugfixes - sorry :-( 5.02 04/02/2014 -Bug fixes (iOS 7.x)
-Latest database
-Performance improvements 5.01 03/28/2014 -New look and layout
-Requires iOS6 and above
-84 DP, Mod 0.4, Mod 0.6 pitch support 5.0 02/19/2014 *Bug fixes
*latest database and logos 4.80 10/28/2013 -iPad support!
-Latest database 4.70 03/25/2013
version 7.5.1
posted on 2026-10-06
Version History -Car search now works by manufacturer name as well
-Fixed some manufacturer logo display issues
-Improved the database update process
-Some updated manufacturer logos
-Fixed an issue with Zen Racing no longer showing 7.5.1 11/11/2025 -Improved search results now show the correct number of results
-Updated for iOS 26
-Latest version of the car database 7.5 09/22/2025 -Improved the app layout when landscape on the largest phones 7.4.1 01/08/2025 -Fixed an issue with the charts disappearing for saved cars - thanks Ali!
-Pull to refresh on the Manufacturers list now updates the car database 7.4 12/11/2024 -You can now save cars, with notes etc
-Saved cars can now be amended 7.3 12/07/2024 -Improved data entry for pinion, spur and tyre diameters to allow faster calculations
-Historic saved cars can now have their gear, spur, pitch and diameters adjusted for calculations, however changes will not yet be saved 7.2 12/03/2024 -Improved charts
-Updated database 7.1 11/28/2024 Ratio Calc is back, modernised, and free. Please consider leaving a tip.
-Easily searchable cars list
-Quickly mark your favourite cars
-Dark mode
-Dark mode app icons
-Transponder widget 7.0 11/25/2024 -Support for the latest devices and iOS
-Improved the database update process to show more details
-Removed the text erasing buttons on the text fields when editing notes
-Moved the gear and diameter pickers up so that the results can be seen whilst changing the settings
-Updated database and manufacturers
-Various other little tweaks and improvements
Enjoy your R/C racing! 6.6 02/23/2019 We've added a tip jar - the app has been kept up to date since 2011 and we've never charged for an update. Any tip will unlock the ability to change the app's colour scheme and app icon - we've even included some retro icons that may be familiar to long time users.
Also in this version:
-Improved watch app reliability
-Transponder input form improvements
-Other boring little fixes and optimisations 6.5 01/23/2018 -iPhone X support
-Improved Apple Watch app (watchOS 2+ required)
-Now you can save motor and timing details for your saved cars
-Improved displays when using larger display fonts 6.4 01/08/2018 - Change of support email address
Enjoy your racing! 6.3.1 01/26/2017 -You can now update the car database more easily
-iOS10 compatibility
-Latest car database included 6.3 11/11/2016 -Improved car database updating - simply pull to refresh on the manufacturers screen
-Quickly copy your transponder number into the clipboard
-Fixed an issue with the ruler displaying incorrectly
-Improved iPad Pro support 6.2 05/14/2016 - Transponder store improvements - you can now save more than 3 transponder numbers - thanks to Jason H for the suggestion.
****Note:**** Please ensure you visit the transponder store part of the app to migrate your existing transponder numbers over to the new version. Until this is done they will not show in the Today widget or on the Apple Watch Glance.
- iPad multitasking support for iO9
- Revised app layouts - faster navigation using tabs
- Several other tweaks and improvements 6.1 11/03/2015 -Database update URL has now changed. This version is required to continue receiving car database updates.
-Fixed a bug which hid the car notes under the keyboard if the note was more than a few lines long. Thanks Michael T for reporting this. 6.0.1 10/06/2015 Introducing Ratio Calc! for Apple Watch - view your cars ratio/rollout with ease.
Now you can store your transponder numbers so that they're available quickly when booking in - view them either on the Apple Watch or on the Today screen (iOS8 required).
If you love using Ratio Calc! please leave a review - it's greatly appreciated. Many thanks. 6.0 05/28/2015 -Updated for iOS8, iPhone 6, iPhone 6+
-Latest car database
-iOS7 is now a minimum requirement
-Bug fixes 5.10 01/26/2015 -Quick access chart buttons for saved cars now display correct pinion/spur info 5.03 06/05/2014 More iOS7 bugfixes - sorry :-( 5.02 04/02/2014 -Bug fixes (iOS 7.x)
-Latest database
-Performance improvements 5.01 03/28/2014 -New look and layout
-Requires iOS6 and above
-84 DP, Mod 0.4, Mod 0.6 pitch support 5.0 02/19/2014 *Bug fixes
*latest database and logos 4.80 10/28/2013 -iPad support!
-Latest database 4.70 03/25/2013 -Mod 1.0 support
-Mod 0.8 support
-Latest database 4.60 12/13/2012
version 7.5.1
posted on 2025-11-11
-Car search now works by manufacturer name as well
-Fixed some manufacturer logo display issues
-Improved the database update process
-Some updated manufacturer logos
-Fixed an issue with Zen Racing no longer showing
version 7.5
posted on 2025-09-22
Sep 22, 2025
Version 7.5
-Improved search results now show the correct number of results
-Updated for iOS 26
-Latest version of the car database
version 7.4.1
posted on 2025-01-08
Jan 8, 2025
Version 7.4.1
-Improved the app layout when landscape on the largest phones
version 7.4
posted on 2024-12-11
Dec 11, 2024
Version 7.4
-Fixed an issue with the charts disappearing for saved cars - thanks Ali!
-Pull to refresh on the Manufacturers list now updates the car database
version 7.2
posted on 2024-12-03
Dec 3, 2024
Version 7.2
-Improved data entry for pinion, spur and tyre diameters to allow faster calculations
-Historic saved cars can now have their gear, spur, pitch and diameters adjusted for calculations, however changes will not yet be saved
version 6.6
posted on 2019-02-23
23 Feb 2019 Version 6.6
-Support for the latest devices and iOS
-Improved the database update process to show more details
-Removed the text erasing buttons on the text fields when editing notes
-Moved the gear and diameter pickers up so that the results can be seen whilst changing the settings
-Updated database and manufacturers
-Various other little tweaks and improvements
Enjoy your R/C racing!
version 6.6
posted on 2019-02-23
Feb 23, 2019 Version 6.6
-Support for the latest devices and iOS
-Improved the database update process to show more details
-Removed the text erasing buttons on the text fields when editing notes
-Moved the gear and diameter pickers up so that the results can be seen whilst changing the settings
-Updated database and manufacturers
-Various other little tweaks and improvements
Enjoy your R/C racing!
version 6.2
posted on 2011-05-12
Disclaimer
Official App Store Link
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