# Hardness Converter

> Converts metallic material hardness scales with shape corrections. (iPhone/iPad app by Buehler LTD..)

- Source: https://appshunter.io/ios/app/hardness-converter/id371816611 (this page in markdown: same URL + `.md`)
- Developer: [Buehler LTD.](https://appshunter.io/developer/1292045110)
- Category: Utilities, Reference
- Price: Free
- Rating: 5.00/5 from 4 App Store ratings · 9 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 25 MB
- Languages: American English
- Released: 2010-05-20
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/hardness-converter/id371816611/reviews.md

## What is Hardness Converter?

Version 2.0 is here! Includes conversions and shape corrections based on the latest ASTM and ISO tables!!!

The Wilson Hardness Converter is a simple tool for converting between popular scales used to measure the hardness of metallic materials.

The hardness of a material can correlate to tensile strength, wear resistance, ductility, and other physical characteristics.

Features:
 - Convert between popular Rockwell, Vickers, Knoop, and Brinell hardness scales.
- Cylindrical and Spherical corrections for Rockwell scales.

Available Scales:
- HRC
- HRB
- HRA
- HRD
- HRE
- HRF
- HRG
- HRK
- HR15N
- HR30N
- HR45N
- HR15T
- HR30T
- HR45T
- Knoop
- Vickers
- Brinell

Note: This tool should be used for reference only.

## Key features

- Converts between Rockwell, Vickers, Knoop, and Brinell scales
- Includes cylindrical and spherical corrections for Rockwell
- References latest ASTM and ISO tables
- Supports numerous Rockwell sub-scales (HRC, HRB, HRA, etc.)
- Provides reference for material properties correlation

## Recent user reviews (9 of 9)

All indexed reviews: https://appshunter.io/ios/app/hardness-converter/id371816611/reviews.md

### 5/5 — Fantastic app

*2017-09-15*

Thank you for updating this app, I was afraid it may be scrapped for iOS 11. I use this app all the time, it's simple, straightforward & fast.

### 5/5 — Never Use a Wall Chart Again

*2014-01-15*

This app has everything most engineers could want regarding hardness conversion. The built-in roundness correction is also a nice touch. The only deficiency I can see is that the Knoop and Vickers hardnesses are not explicitly stated as macro- or microhardness, although that is the case for ASTM A370 and I can't be too mad about that.

### 5/5 — Engg consultant

*2011-06-20*

Great work! Really nice and handy app.

### 4/5 — Nice app

*2011-04-01*

Installed the app this morning and have already been using it often. Very handy.

### 1/5 — User

*2010-07-19*

I was disappointed because the conversions did not match the values of the Wilson chart.

### 5/5 — Great tool!

*2010-05-27*

Finally...

### 5/5 — Very Handy!

*2010-05-25*

Nice to have conversions quickly and easily available.

### 5/5 — Great app!

*2010-05-24*

Very useful conversion tool

### 5/5 — AWESOME !!!

*2010-05-20*

This is the best damn app ever!! Now I just need to start writting code for hardness systems. Nice work !!

## Frequently asked questions about Hardness Converter

### What scales does Hardness Converter support?

Hardness Converter supports a wide range of scales including HRC, HRB, HRA, HRD, HRE, HRF, HRG, HRK, HR15N, HR30N, HR45N, HR15T, HR30T, HR45T, Knoop, Vickers, and Brinell.

### Does Hardness Converter offer any corrections?

Yes, Hardness Converter includes cylindrical and spherical corrections specifically for Rockwell hardness scales, based on the latest ASTM and ISO tables.

### Is Hardness Converter free to use?

Yes, Hardness Converter is completely free to download and use. It does not have any in-app purchases or advertisements.

### What devices is Hardness Converter available on?

Hardness Converter is available for iPhone and iPod devices.

### How often is Hardness Converter updated?

The latest version of Hardness Converter is 2.4.2, which was last updated on February 27, 2021. Users can expect updates to reflect current standards.

### What is the age rating for Hardness Converter?

Hardness Converter has an age rating of 4+, making it suitable for a wide audience.

### What is the user sentiment for Hardness Converter?

Based on available data, Hardness Converter has a perfect rating of 5.0 stars from 4 ratings, indicating very positive user sentiment.

### Does Hardness Converter have ads?

No, Hardness Converter is ad-free. It provides a clean user experience without any advertisements.

## Version history (last 5 releases)

### 2.4.2 — 2021-02-27

Updated to conform to new Apple app store guidelines.

### 2.3.3 — 2017-10-12

- Additional minor Bug fixes.

### 2.3.2 — 2017-09-29

- Additional minor bug fixes.

### 2.3.1 — 2017-09-27

- Minor bug fixes.

### 2.3.0 — 2017-09-15

What's new in 2.3:
- iOS 11 compatibility updates
- Bug fixes
- Add newer screen aspect ratios / resolutions

## More apps by Buehler LTD.

- [Hardness Converter HD](https://appshunter.io/ios/app/hardness-converter-hd/id545857260)
- [Buehler Sales](https://appshunter.io/ios/app/buehler-sales/id1330651093)

All apps by Buehler LTD.: https://appshunter.io/developer/1292045110

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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 2026-06-10.*