Trelleborg’s “Unit and Hardness Converter” converts a comprehensive list of units (incl. currencies) in an easy way.
In addition, the app has a set of other useful features on board, like timezone conversion, percentage calculations, a running pace calculator and more

What our users say:
“Have been using it forever, never tried other converter as this one does the job perfectly” - Lazareth_fr

“Fabulous resource, but also a functional masterpiece!” -Otto.

“This is needed by all engineers. So simple and easy to use” -JLa03.

• Easy-to-use interface
• Currency converter with in-app exchange rate update functionality
• Over 300 engineering and scientific conversion units in 32 categories
• Hardness converter with 16 conversion tables based on ASTM E140-07 and ISO-18265 for quick conversion between different scales
• Video library: features the extensive Trelleborg Sealing Solutions YouTube library
• Toggle between units
• Switch between dark and white theme
• Conversion history log
• Create favorite lists
• Standard calculator integrated with unit converter

• Area
• Currency
• Current
• Data
• Density
• Distance
• Dynamic Viscosity
• Energy
• Force
• Frequency
• Kinematic Viscosity
• Moment of inertia
• Power
• Prefixes
• Pressure
• Speed
• Strength
• Temperature
• Time
• Torque
• Volume
• Weight
• Fuel Consumption
• Glucose
• Vacuum
• Numbers
• Illumination
• Radioactivity
• Radiation (absorbed)
• Angles
• Volume Flow Rate
• Calorie
• Metric Prefixes
• Typography
• Electric Charge

• Timezone conversion
• Clothing sizes / Shoe sizes
• International power plugs
• Running pace calculator
• Percentage calculator
• Pace
• Hex, Binary, Decimal
• BMI (metric/inch)

• Rockwell (HRC, HRA, HRD, HRF, HRG, HRE, HR-15-N, HR-30N, HR-45-N, HR45-T, HR-15T, HR-30T, HR45-T)
• Brinell (HBW, HBS)
• Vickers (HV,
• Knoop (HK)

The app is available in English, German and Chinese languages.
Download now or contact us with any questions.

What’s New

Version 4.4

Minor bug fixes.

Ratings and Reviews

4.9 out of 5
306 Ratings

306 Ratings

GaoDY ,

This is THE converter!

I couldn't imagine I'm so pumped to write a review for a converter App! When I saw there are BMI, timezone/country information and even clothing and shoe sizes conversion, I couldn't help put a grin on my face. Not to mention all other comprehensive units that's covered in this app, for free! And the UI is clear andveasy to navigate. I've always wanted to find a have-it-all converter app, which haven't been able to until now. That's why I have to leave this review, which I seldom do for my other about 200 apps... Just impressive app!

798798779879 ,

It’s finally time to thank TSS.

Today, for the first time ever I think, when I opened the app it asked for a rating. I was about to dismiss it (as I do for ever other app) when I thought: “Hey... I’ve been using this flawlessly designed and ad-free app since 2012, and gotten so much use out of it, and they’ve never asked anything in return.”

So here I am. Thanks Trelleborg Sealing Solutions! Five stars for you. Give the app devs a raise and keep... sealing stuff... or whatever it is you do.

oneman_onebeard ,

Ecstatic to own it, proud to review it

I don’t review apps, however, Converter has been such an important app for me I felt it deserved my review. It meets both requirements for an app (let alone a utility app) of being very user friendly and functional. I would say the functionality stands out the most. Every conceivable conversion I’ve ever needed I’ve found in the app and that barely scratched the surface in terms of how many different dimensions are available.

App Privacy

The developer, Trelleborg Sealing Solutions, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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