# Hardness Converter HD

> Converts metallic material hardness between Rockwell, Vickers, Knoop, and Brinell scales. (iPhone/iPad app by Buehler LTD..)

- Source: https://appshunter.io/ios/app/hardness-converter-hd/id545857260 (this page in markdown: same URL + `.md`)
- Developer: [Buehler LTD.](https://appshunter.io/developer/1292045110)
- Category: Utilities, Business
- Price: Free
- Rating: 4.00/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 31 MB
- Languages: English
- Released: 2012-08-17
- Data updated: 2026-07-04
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/hardness-converter-hd/id545857260/reviews.md

## What is Hardness Converter HD?

Introducing the big brother to the Wilson Hardness Converter iPhone app.

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

- Convert between Rockwell, Vickers, Knoop, Brinell scales
- Cylindrical and Spherical Rockwell corrections
- Supports numerous Rockwell sub-scales (HRC, HRB, etc.)
- Reference tool for material hardness

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/hardness-converter-hd/id545857260/reviews.md

### 3/5 — ASTM E 140

*2014-08-29*

It is not clear if this conversion program coincides with ASTM E 140 and as such it's usefulness is in question especially when compliance with NACE MR0175 is mandated.

### 5/5 — Tom

*2013-06-12*

Easy to use.  Nice graphics.

## Frequently asked questions about Hardness Converter HD

### What metallic material hardness scales does Hardness Converter HD support?

Hardness Converter HD 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 HD offer any special corrections for hardness scales?

Yes, the app provides cylindrical and spherical corrections specifically for the Rockwell hardness scales, enhancing accuracy for certain material shapes.

### Is Hardness Converter HD available on Android devices?

No, Hardness Converter HD is currently only available for iPad devices, as indicated by its supported devices list.

### How often is Hardness Converter HD updated?

The app was last updated on February 25, 2021, with version 2.4.2. While not frequently updated, it remains a stable utility.

### What is the user rating for Hardness Converter HD?

Hardness Converter HD has a rating of 4.0 stars based on 2 user ratings. This suggests a generally positive reception from its user base.

### Does Hardness Converter HD have advertisements?

No, Hardness Converter HD is ad-free, providing a clean and uninterrupted user experience for its conversion functions.

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

The app has an age rating of 4+, making it suitable for a broad audience without mature content.

### Is Hardness Converter HD suitable for professional engineering use?

The app is intended for reference use only, as stated in its description. While it provides useful conversions, professional engineers should always verify critical data with calibrated equipment.

## Version history (last 5 releases)

### 2.4.2 — 2021-02-25

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 — 2017-09-28

- 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

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## More apps by Buehler LTD.

- [Hardness Converter](https://appshunter.io/ios/app/hardness-converter/id371816611)
- [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 2026-07-04.*