# Tire Size Calculator Plus — Compare Tire Sizes with Visual

> Calculate and compare tire size specifications with visual aids. (iPhone/iPad app by Heng Jia Liang.)

- Source: https://appshunter.io/ios/app/tire-size-calculator-plus/id1637383013 (this page in markdown: same URL + `.md`)
- Developer: [Heng Jia Liang](https://appshunter.io/developer/1532000635)
- Category: Utilities, Productivity
- Price: $2.99
- Rating: 3.60/5 from 5 App Store ratings
- Age rating: 4+
- Requires: iOS 13 · 2 MB
- Languages: American English, Finnish, French (France), German (Germany), Italian, Japanese, Russian, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2022-08-01
- Data updated: 2026-08-09
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/tire-size-calculator-plus/id1637383013/reviews.md

## What is Tire Size Calculator Plus?

Tire size comparison the easy way before you buy. Use our tire size calculator to compare diameter, width, sidewall, circumference and revolutions per mile for 2 tires.

Tire size calculator takes two tire sizes and directly calculates the differences between the tires diameter, width, sidewall, circumference and revolutions per mile. 
Metric or imperial output available.
It also shows examples of your speedometer reading with the first tire, and the actual speed you're traveling if you were to install the second tire. 
An illustration between 2 tire size and shape are show for better understanding on how it looks like.
A very useful tool when searching for tires that are a different size than stock. Enjoy this app for all your tire size comparison needs.

Check Your Tire's Sidewall:
• With a little explanation it's easy to understand what all of the letters and numbers mean on your tire's sidewall. The numbers are indicators of the size, type, and performance of the tire.
• Tire Type The letter "P" at the beginning of the "Tire Size" tells us the tire is a P-Metric tire, referring to tires made to certain standards within the United States, intended for Passenger vehicles.
• If a tire size has no letters at the beginning, this indicates a Euro metric tire. P-Metric and Euro-Metric tires may have different load capacities.
• The letters "LT," either at the beginning or at the end of the tire size indicate the tire was designed for light trucks. Vehicle manufacturers equip some light trucks with "LT" type tires. These tires generally require higher inflation pressures than passenger tires.
• Consult your owner's manual or tire placard for the recommended tire size and inflation pressure for your vehicle. 

Tire Width is the width of the tire measured in millimeters from sidewall to sidewall. The first three-digit number in the tire size refers to the tire width. For instance, in a size P220/40 R17 tire, the width is 220 millimeters. 

Aspect Ratio is the ratio of the height of the tire's cross-section to its width. The two-digit number after the slash mark in a tire size is the aspect ratio. For example, in a size P220/40 R17 tire, the 40 means that the height is equal to 40% of the tire's width. The bigger the aspect ratio, the bigger the tire's sidewall will be. 

Construction. The letter "R" in a tire size stands for Radial, which means the layers run radially across the tire. 

Wheel Diameter is the size of the wheel measured from one end to the other. It tells us the size of the wheel that the tire is intended to fit. A size P220/40 R17 tire is made for a wheel with a 17 in diameter.

Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

## Key features

- Compare two tire sizes
- Calculate diameter, width, sidewall, circumference
- Revolutions per mile calculation
- Metric or imperial output
- Speedometer reading adjustment
- Visual tire size illustration
- Tire sidewall code explanation

## Chart rankings

- #188 in Top Paid · Utilities (US App Store)


## Frequently asked questions about Tire Size Calculator Plus

### What is the price of Tire Size Calculator Plus?

Tire Size Calculator Plus is a paid app, priced at $2.99. This one-time purchase grants you access to all its features without further costs.

### Does Tire Size Calculator Plus have ads?

No, Tire Size Calculator Plus is ad-free. You can use all its functionalities without any interruptions from advertisements.

### What devices is Tire Size Calculator Plus compatible with?

Tire Size Calculator Plus is available for iPhone, iPad, and iPod. It is designed to run on Apple's mobile operating systems.

### How often is Tire Size Calculator Plus updated?

The app was last updated on January 27, 2026, with version 1.1. While specific update frequency isn't detailed, this indicates ongoing support and potential improvements.

### What is the age rating for Tire Size Calculator Plus?

Tire Size Calculator Plus has an age rating of 4+. This means it is suitable for users of all ages, with no content restrictions.

### Can Tire Size Calculator Plus help me understand my tire's sidewall markings?

Yes, Tire Size Calculator Plus provides explanations for the letters and numbers on your tire's sidewall. This helps you understand tire size, type, and performance indicators.

### Does Tire Size Calculator Plus show how different tire sizes affect my speedometer?

Yes, the app illustrates how your speedometer reading might change if you install a different tire size than your stock tires. This helps you understand potential speed discrepancies.

### What kind of user feedback does Tire Size Calculator Plus have?

Tire Size Calculator Plus has an average rating of 3.6 stars from 5 ratings. This suggests a generally positive but mixed user reception.

## Version history (last 2 releases)

### 1.1 — 2026-01-27

- Updated for the newest devices.
- Minor bugs fixed.

### 1.0 — 2022-08-01

No release notes.

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All apps by Heng Jia Liang: https://appshunter.io/developer/1532000635

## Related topics

[tire size calculator plus](https://appshunter.io/ios/topics/tire-size-calculator-plus) · [tire sizes](https://appshunter.io/ios/topics/tire-sizes) · [car tire size calc](https://appshunter.io/ios/topics/car-tire-size-calc) · [tire size calculator](https://appshunter.io/ios/topics/tire-size-calculator) · [tire size correspondence](https://appshunter.io/ios/topics/tire-size-correspondence)

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*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 2026-08-09.*