# Tire Size Calculator — Cars, LT, Moto & Weight

> App to compare tire and wheel specs for safe upgrades and performance calculations. (iPhone/iPad app by Cheng Fan.)

- Source: https://appshunter.io/ios/app/tire-size-calculator/id599384920 (this page in markdown: same URL + `.md`)
- Developer: [Cheng Fan](https://appshunter.io/developer/599384923)
- Category: Utilities, Reference
- Price: $1.99 (on sale, was $2.99)
- Age rating: 4+
- Requires: iOS 12.0 · 4 MB
- Languages: American English, Dutch, French (France), German (Germany), Italian, Japanese, Korean, Malay, Norwegian Nynorsk, European Portuguese and 5 more
- Released: 2013-02-11
- Data updated: 2026-09-06
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/tire-size-calculator/id599384920/reviews.md

## What is Tire Size Calculator?

MORE SIZE SYSTEMS. THE SAME DEEP WEIGHT MODEL.

Compare passenger-car, light-truck/high-flotation and motorcycle tire sizes in one focused calculator. TireCalc supports modern metric sizing, legacy full-profile sizes, LT direct-diameter designations, and catalog-backed motorcycle metric, inch, alphabetic and ATV/UTV formats.

GO BEYOND SIZE: ROTATING WEIGHT

Tire and wheel weight is rotating, unsprung mass—not just another number on a scale. For car and light-truck comparisons, enter each tire and wheel weight plus vehicle weight, peak torque and 0–60 time.

The app models the total mass change and rotational inertia of all four assemblies, then displays an estimated equivalent vehicle-weight range during acceleration. Enthusiasts can compare lightweight setups quantitatively; first-time buyers can see why reducing a few pounds at each wheel may matter more than the scale alone suggests. The result is shown as a range across several mass-distribution assumptions, not as a misleading single claim.

One-time purchase. No ads, subscriptions or data collection.

COMPARE THE NUMBERS

• Overall diameter and circumference
• Section width and sidewall height
• Actual vehicle speed at 60 and 100
• Load index and speed rating
• Tire and wheel weight
• Four-wheel mass change, rotational inertia and modeled equivalent vehicle-weight range

MORE WAYS TO ENTER A TIRE

• Modern passenger/LT metric: widths from 125 through 405 and profiles from 20 through 85
• Legacy full-profile: exact table-based dimensions, including applicable “82-series” equivalents
• LT/high-flotation: direct overall diameter, width and rim designations
• Motorcycle: catalog-backed metric, inch, alphabetic and ATV/UTV sizes, including structure and rim-code distinctions

FIND CAR AND LT SIZE ALTERNATIVES

Set allowable changes for rim diameter, section width and circumference. TireCalc generates alternatives you can select and compare instantly.

SEE THE DIFFERENCE

Use scaled tire diagrams in side-by-side or half-circle mode to understand how two setups differ visually. Switch between imperial and metric measurements at any time.

BUILT-IN GUIDANCE

The Size Guide explains each supported format and its limits. A valid designation is not vehicle fitment approval: load, speed, rim, clearance and manufacturer requirements still apply. Never translate a motorcycle rim code into inches by appearance, and never use a calculated result as permission to mount a tire.

Always confirm final tire and wheel compatibility with the vehicle or motorcycle manufacturer, the tire manufacturer, and a qualified tire professional before purchasing or installing equipment.

## Key features

- Compare tire and wheel specs
- Get upgrade recommendations
- Calculate sprung weight difference
- Supports Imperial and Metric units
- Visual tire comparison graphs
- Adjustable difference variables

## Recent user reviews (10 of 31)

All indexed reviews: https://appshunter.io/ios/app/tire-size-calculator/id599384920/reviews.md

### 4/5 — もう少し細かく

*2026-08-10*

対応ありがとうございます


インチアップ、外径アップに利用してます

タイヤ幅 135
扁平率 82
に対応してくれると助かります

**Developer response:** Added support for this in 2.4.0.

### 4/5 — もう少し細かく

*2025-08-05*

インチアップ、外径アップに利用してます

タイヤ幅 135
扁平率 82
に対応してくれると助かります

### 1/5 — Waste of money

*2020-08-26*

Don’t waste your money on this app.

### 5/5 — 能不能更新加入摩托车的尺寸，摩托车的尺寸都是整数没有.5的，能到110就行，感谢

*2020-07-17*

能不能更新加入摩托车的尺寸，摩托车的尺寸都是整数没有.5的，能到110就行，感谢

**Developer response:** 在2.4.0版本新加入了摩托车轮胎尺寸的支持。

### 3/5 — 别下 一共就六个数据

*2020-02-15*

别花这冤枉钱

### 1/5 — 被骗18元

*2019-12-06*

为什么这种骗人的软件也能通过苹果的审核？？？？

### 1/5 — 別被騙了

*2019-07-08, version 2.1.0*

騙人的東西

### 1/5 — 没什么作用，跟电脑网页的轮胎计算器一样

*2019-06-29*

没什么作用，被骗了18元。

### 2/5 — 待改进

*2019-06-21*

1.没有明确告知误差多少是允许范围
2.介绍几乎没有 新手都不知道数值的含义例如簧上增加或减少对原车的影响
3.你可以收费但是要有收费的意义 
4.综合评估目前的功能很不值这个价 如果后续有改进的话可以考虑购买

### 1/5 — 太平洋汽车网有免费的，不要下了

*2018-08-26*

对于小白没帮助，对于大神是鸡肋。

## Frequently asked questions about Tire Size Calculator

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

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

### Does Tire Size Calculator have ads?

No, Tire Size Calculator is ad-free. Users can enjoy a seamless experience without any advertisements interrupting their calculations.

### What devices does Tire Size Calculator support?

Tire Size Calculator is a universal app that works on iPhone, iPad, and iPod Touch. You do not need to pay twice for different devices.

### How often is Tire Size Calculator updated?

The app was last updated on November 28, 2024, with version 2.3.0. This indicates regular updates to maintain compatibility and potentially add new features.

### Can I compare different tire sizes with Tire Size Calculator?

Yes, you can compare tires with detailed specs in both Imperial and Metric units. The app provides scaled visual graphs to show differences in tire dimensions.

### What kind of performance metrics can Tire Size Calculator estimate?

The app can calculate approximate equivalent car chassis (sprung) weight differences after changing tires and wheels. This helps quantify potential performance improvements.

### What age rating does Tire Size Calculator have?

Tire Size Calculator has an age rating of 4+. This suggests it is suitable for a wide range of users, including younger individuals interested in automotive topics.

### Can I adjust variables when looking for upgrade tire sizes?

Yes, you can adjust variables such as rim diameter difference, section width difference, and tolerable tire circumference difference when getting recommended upgrade sizes.

## Version history (last 5 releases)

### 2.4.0 — 2026-07-28

• Adds motorcycle metric, inch, alphabetic and ATV/UTV sizing
• Adds LT/high-flotation direct-diameter sizing
• Expands passenger/LT metric entry to 125–405 widths and 20–85 profiles
• Adds exact legacy full-profile sizing, including applicable 82-series equivalents
• Adds a consolidated Size Guide with format limits and safety guidance
• Fixes the recommended-size dropdown so it can be opened again immediately after a selection
• Retains four-wheel unsprung-weight and rotational-inertia modeling for car and LT comparisons

### 2.3.2 — 2026-07-19

Restores reliable app startup and display on iPhone, iPad, and compatible Mac models.

### 2.3.1 — 2026-07-19

Fresh screenshots and clearer product information make it easier to see how Tire Size Calculator helps compare fit, circumference, speedometer impact, and wheel changes.

### 2.3.0 — 2024-11-28

2.2.2
- Fix the app header and nav tab position issues
- Re-build using the latest XCode and libraries

2.3.0
- Remove horizontal views on iPhone
- Allow window resize on Mac

### 2.2.2 — 2024-11-27

- Fixed the nav header and tab position issues
- Re-built using the latest XCode and libraries

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## Related topics

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

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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 2026-09-06.*