# Tire Calculator > Automotive tire size compatibility calculator for vehicle modifications. (iPhone/iPad app by Extreme Software, Inc..) - Source: https://appshunter.io/ios/app/tire-calculator/id292742872 (this page in markdown: same URL + `.md`) - Developer: [Extreme Software, Inc.](https://appshunter.io/developer/292742875) - Category: Utilities, Reference - Price: $2.99 - Rating: 2.50/5 from 25 App Store ratings · 23 written reviews indexed - Age rating: 4+ - Requires: iOS 10.0 · 2 MB - Languages: American English - Released: 2008-10-16 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/tire-calculator/id292742872/reviews.md ## What is Tire Calculator? This automotive tire calculator will help you determine if your new tire size will be compatible with your factory or previous tire size. This application will show you before and after results for the following: * Sidewall Height, * Wheel&Tire Radius, * Wheel&Tire Diameter, * Tire Circumference, * Rotations per mile or kilometer, * Difference in Speedometer Readings, * And approximate Speedometer Results [This application is compatible with and can display both standard and metric results.] ## Key features - Tire size compatibility check - Sidewall height comparison - Wheel and tire radius/diameter calculation - Tire circumference and rotation count - Speedometer reading difference - Standard and metric unit support ## Recent user reviews (10 of 23) All indexed reviews: https://appshunter.io/ios/app/tire-calculator/id292742872/reviews.md ### 1/5 — Very Basic *2021-05-02, version 2.1* There are many other apps for free that provide the same information. ### 1/5 — Not supported for current iOS versions *2017-07-19* Please refund the purchase price for this. Does not support current iOS versions so app has been deleted. Do not buy this app. **Developer response:** This application has been updated and your reported issue is now resolved. Please try again -- Thank-you! ### 1/5 — Besoin urgente de mise à jour!! *2017-07-04, version 2.0* Fonctionne pas! ### 1/5 — Do not buy *2016-09-13* This app used to work. Hasn't worked for a couple years now, very disappointing. App not compatible with newer IOS software. This app should be removed. **Developer response:** This application has been updated and your reported issue is now resolved. Please try again -- Thank-you! ### 1/5 — Stopped working *2016-09-05* The app worked fine and after upgrade just crashes every time you try to use it **Developer response:** This application has been updated and your reported issue is now resolved. Please try again -- Thank-you! ### 1/5 — Waste of money! *2016-08-28* App just crashes when I try to use it. Absolutely useless. **Developer response:** This application has been updated and your reported issue is now resolved. Please try again -- Thank-you! ### 1/5 — Tire Calculator *2016-03-29* Tried to use. App closes after pressing calculate. Not working junk **Developer response:** This application has been updated and your reported issue is now resolved. Please try again -- Thank-you! ### 1/5 — App crashes *2016-03-17, version 2.0* Continually crashes when attempting to calculate. Please fix. ### 1/5 — Owner *2015-11-26, version 2.0* When I press calculate it kicks me right off ### 4/5 — It great but ........ *2014-06-07, version 2.0* I use this app frequently. I think it's great. If only it had a memory of the last tyre size calculation. Every time I close this app to check a price on eBay or the net, on reopening the app I have to plug all my figures back in again. I'd gladly give 5 stars, and even pay $5 for it, if it did. Also. I want to have a bigger number screen so I can enter my tyres whilst driving. ## Frequently asked questions about Tire Calculator ### What does Tire Calculator show after comparing tire sizes? Tire Calculator displays sidewall height, wheel and tire radius, wheel and tire diameter, tire circumference, rotations per mile, and approximate speedometer results. It also highlights the difference in speedometer readings between the old and new tire sizes. ### Can Tire Calculator handle both standard and metric tire sizes? Yes, Tire Calculator is compatible with and can display both standard and metric results, making it versatile for different regions and tire specifications. ### What is the price of Tire Calculator? Tire Calculator is a paid application, priced at $2.99. This one-time purchase grants you access to all its features. ### On which devices can I use Tire Calculator? Tire Calculator is available for iPhone, iPad, and iPod touch devices. It is designed to work across Apple's mobile ecosystem. ### How often is Tire Calculator updated? The latest version of Tire Calculator is 2.1, which was last updated on October 27, 2017. While updates have not been frequent recently, the app provides core functionality for tire calculations. ### What is the age rating for Tire Calculator? Tire Calculator has an age rating of 4+, indicating it is suitable for users of all ages. Its content is generally appropriate for a wide audience. ### What do users think of Tire Calculator? Tire Calculator has an average rating of 2.5 stars from 25 ratings. This suggests a mixed reception from users, with some finding it useful and others potentially experiencing issues or unmet expectations. ### When was Tire Calculator first released? Tire Calculator was first released on October 16, 2008. It has been available for a significant period, undergoing updates to reach its current version. ## Version history (last 3 releases) ### 2.1 — 2017-10-27 This app has been updated by Apple to display the Apple Watch app icon. The application has been updated to support iOS11 on both the iPhone and the iPad. ### 2.0 — 2009-10-29 Updated for 3.1.2 iPods and iPhones! Added sound! ### 1.0 — 2008-10-09 No release notes. ## More apps by Extreme Software, Inc. - [ePhemeris](https://appshunter.io/ios/app/ephemeris/id323133381) - [Planet Hours](https://appshunter.io/ios/app/planet-hours/id399343304) All apps by Extreme Software, Inc.: https://appshunter.io/developer/292742875 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*