# Fit Tolerance Calculator — Calculate tolerances easily!

> Calculates ISO fit tolerances for holes and shafts based on diameter and tolerance class. (iPhone/iPad app by Kei Suefuji.)

- Source: https://appshunter.io/ios/app/fit-tolerance-calculator/id1448302769 (this page in markdown: same URL + `.md`)
- Developer: [Kei Suefuji](https://appshunter.io/developer/1388335881)
- Category: Utilities, Productivity
- Price: $2.99
- Rating: 5.00/5 from 5 App Store ratings · 18 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 8 MB
- Languages: Russian, American English, Latin American Spanish, Italian, Korean, German (Germany), European Portuguese, Chinese (Traditional, Taiwan), Chinese (Simplified, China), Canadian French and 1 more
- Released: 2019-01-05
- Data updated: 2026-08-18
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/fit-tolerance-calculator/id1448302769/reviews.md

## What is Fit Tolerance Calculator?

The Fit Tolerance Calculator application calculates the fit tolerance of "hole" and "shaft" from the input diameter value. Fit tolerance is calculated based on ISO.
Simply enter the diameter value, select the tolerance range with the tolerance range button, select the tolerance class with the tolerance class button, and the fitting tolerance value of "hole" and "shaft" will be displayed.
In addition, from the combination of the selected hole and shaft, we distinguish the type of fit (clearance fit, transition fit, interference fit). Then, calculate the minimum clearance and the maximum clearance, in the case of clearance in plus, and in case of interference it is written minus.
Input diameter of 3150 mm or less is possible. However, the number of input digits is limited to 6 digits.
The corresponding tolerance range and tolerance grade are as follows.

【Tolerance of ​​hole】
A, B, C, CD, D, E, EF, F, FG, G, H, JS, J, K, M, ZA, ZB, ZC

* Note 1) A and B holes are not used for standard dimension 1 mm or less.
* Note 2) JS 7 to JS 11 are rounded down to the decimal point so that IT / 2 becomes an integer of micrometer unit.
* Note 3) The tolerance grade of J hole is IT6 to IT8 only.


【Tolerance of ​​shaft】
a, b, c, cd, d, e, ef, f, fg, g, h, js, j, k, m, n, p, r, s, t, u, v, x, za, zb, zc

* Note 4) The a and b shaft are not used for standard dimension 1 mm or less.
* Note 5) js 7 to js 11 are rounded down to the decimal point so that IT / 2 becomes an integer of micrometer unit.
* Note 6) The tolerance grade of the j shaft is IT5 to IT8 only.

【Tolerance Grade】
IT 1 to IT 18

* Note 7) The tolerance grades IT14 to IT18 are not applied to the standard dimension of 1 mm or less.
* Note 8) Tolerance values ​​of tolerance grades IT1 to IT5 for reference dimension exceeding 500 mm are provisional for experimental use.

## Key features

- Calculate hole and shaft fit tolerances
- Based on ISO standards
- Select tolerance ranges and classes
- Distinguish fit types (clearance, transition, interference)
- Calculate minimum and maximum clearance/interference
- Supports diameters up to 3150 mm

## Recent user reviews (10 of 18)

All indexed reviews: https://appshunter.io/ios/app/fit-tolerance-calculator/id1448302769/reviews.md

### 5/5 — 非常好👍

*2025-10-19*

非常好。简单直接 没有广告

### 3/5 — Нолевой функционал

*2024-09-08*

За 199₽
Осталось добавить в info как в немецком приложении, никакой ответственности за цифры.

### 5/5 — 最适用

*2024-04-01*

这软件太好用了，机加工人必备工具。

### 3/5 — Нет допусков по IT/2

*2023-10-23*

Почему нет линейных допусков, только допуска по отверстию и валу , хотелось бы что бы добавили

### 5/5 — Вылетает приложение

*2021-06-03*

Все отлично , но при выборе Z1 или Z2 приложение вылетает

**Developer response:** Спасибо, что сообщили мне об ошибке в приложении.
Мы создаем обновленную версию ver1.4.0, в которой исправлена ошибка. Загрузите его, когда он будет выпущен, и проверьте, устранена ли проблема.
На этот раз мы очень сожалеем о проблеме.
Пожалуйста, дай мне знать, если возникнут какие-либо вопросы.

-- English --
Thank you for letting me know about the bug in the app.
We are creating an updated version of ver1.4.0 that fixes the bug. Please download it when it is released and check if the problem is fixed.
We are very sorry for the problem this time.
Please let me know if you have any questions.

### 1/5 — 没用的玩意

*2021-04-29*

真没用，还骗人6元钱

### 5/5 — Все отлично, но...

*2021-02-05*

когда включаешь темную тему, сливается шрифт в графе куда вписывать диаметр. Исправьте пожалуйста, не очень удобно.

**Developer response:** Мы приносим свои извинения за доставленные неудобства.
Ошибка, из-за которой символы не видны в темном режиме, была исправлена в обновлении до версии 1.3.2.
Пожалуйста, обновите до последней версии и используйте ее. Спасибо за сотрудничество.

-- English --
We apologize for any inconvenience.
The bug that characters are not visible in dark mode has been fixed in the update of ver1.3.2.
Please update to the latest version and use it. Thank you for your cooperation.

### 5/5 — Супер

*2021-02-03*

На iPhone se 2017 года прошивка iOS 14.4 при написании размера отверстая или вала в мм не отображается цифра которую пишу, она видна только в окнах с допусками

**Developer response:** Спасибо за использование этого приложения.
Кроме того, нам очень жаль, что возникла проблема с отображением символов.
Мы обновим его, чтобы исправить ошибку, заключающуюся в том, что символы не отображаются, поэтому, пожалуйста, загрузите и попробуйте его, когда он будет выпущен.
Подождите некоторое время, пока не будет выпущено обновление.

--English--
Thank you for using this app.
In addition, we are very sorry that a problem has occurred in the display of characters.
We will update it to fix the bug that the characters are not displayed, so please download and try it when it is released.
Please wait for a while until the update is released.

### 5/5 — Неплохое приложение

*2021-01-26*

Мне в нём не хватает:
Отображения максимального и минимального значения размера.
Отображения среднего значения размера.
Возможности копирования отображаемых результатов.
А в общем и целом спасибо за продукт!

**Developer response:** Спасибо за использование этого приложения.
Также благодарю вас за ценный совет.
Обновлено с возможностью копирования результатов.
Пожалуйста, скачайте и попробуйте!

--English--
Thank you for using this app.
Also, thank you for your valuable advice.
Updated with the ability to copy results.
Please download and try it!

### 1/5 — 骗钱的

*2020-11-12*

骗钱的。孔轴都只能输入一个数值

## Frequently asked questions about Fit Tolerance Calculator

### What is the Fit Tolerance Calculator app?

The Fit Tolerance Calculator app helps users calculate the fit tolerance for holes and shafts based on ISO standards. It allows input of diameter, selection of tolerance ranges and classes, and provides detailed fit analysis.

### What is the price of the Fit Tolerance Calculator app?

The Fit Tolerance Calculator app is a paid application priced at $2.99. This one-time purchase grants access to all its features for calculating fit tolerances.

### What devices does the Fit Tolerance Calculator app support?

The Fit Tolerance Calculator app is available for iPhone, iPad, and iPod touch devices. It is designed to function across these Apple platforms.

### How accurate are the calculations in the Fit Tolerance Calculator app?

The app calculates fit tolerances based on established ISO standards, providing precise values for clearance, transition, and interference fits. It supports a wide range of diameters and tolerance grades for accurate engineering calculations.

### Does the Fit Tolerance Calculator app have ads?

No, the Fit Tolerance Calculator app does not contain advertisements. As a paid application, it offers an ad-free experience for users focused on engineering calculations.

### How often is the Fit Tolerance Calculator app updated?

The Fit Tolerance Calculator app was last updated on January 3, 2026, with version 1.8.0. While this indicates a recent update, the frequency of future updates is not specified but suggests ongoing development.

### What is the age rating for the Fit Tolerance Calculator app?

The Fit Tolerance Calculator app has an age rating of 4+. This indicates it is suitable for users of all ages, with no content restrictions.

### Can I calculate tolerances for very large diameters with Fit Tolerance Calculator?

Yes, the Fit Tolerance Calculator app supports input diameters of up to 3150 mm. However, the number of input digits is limited to 6 digits for practical use.

## Version history (last 5 releases)

### 1.8.0 — 2026-01-03

Minor improvements.

### 1.7.0 — 2024-07-30

This update supports iOS 17.5.

### 1.6.0 — 2023-02-05

This update supports iOS16.2.

### 1.5.0 — 2022-02-16

Minor bug fixes

### 1.4.0 — 2021-06-05

Minor bug fixes

## Apps similar to Fit Tolerance Calculator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Tolerance Master](https://appshunter.io/ios/app/tolerance-master/id6759722609) | — | Free | Utilities |
| [Fit Tolerance ISO Pro](https://appshunter.io/ios/app/fit-tolerance-iso-pro/id1397159146) | 5.0 (1) | $0.99 | Utilities |
| [Fit Tolerance ANSI](https://appshunter.io/ios/app/fit-tolerance-ansi/id1294112198) | 5.0 (2) | Free | Utilities |
| [机械设计云平台--英科宇软件](https://appshunter.io/ios/app/id1450477637) | 5.0 (1) | Free | Utilities |
| [Gear Calculator Pro](https://appshunter.io/ios/app/gear-calculator-pro/id6463792360) | 5.0 (1) | Free | Utilities |
| [Cutting modes](https://appshunter.io/ios/app/cutting-modes/id1626658682) | — | Free | Utilities |

## More apps by Kei Suefuji

- [Rotational Speed Converter](https://appshunter.io/ios/app/rotational-speed-converter/id1388335882)
- [Hardness Unit Converter](https://appshunter.io/ios/app/hardness-unit-converter/id1409248484)
- [Force Unit Converter](https://appshunter.io/ios/app/force-unit-converter/id1415262579)
- [Motor Power Calculator](https://appshunter.io/ios/app/motor-power-calculator/id1429280610)
- [Torque Unit Converter](https://appshunter.io/ios/app/torque-unit-converter/id1434537031)
- [Color Scheme Designer](https://appshunter.io/ios/app/color-scheme-designer/id1435485163)

All apps by Kei Suefuji: https://appshunter.io/developer/1388335881

---

*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 2026-08-18.*