Microsoft Is Open Sourcing…Windows Calculator

Posted on March 6, 2019 by Mehedi Hassan in Windows, Windows 10 with 27 Comments

It’s no secret Microsoft has been a major contributor in the open-source community as of late. The company has open-sourced a bunch of major projects and tools over the last few years, and it’s now open-sourcing another major part of Windows: the calculator app.

Windows Calculator is being open-sourced under the MIT license on GitHub. The full project is available on GitHub right now, allowing developers to get access to the full source-code that powers the built-in calculator on Windows 10.

“As developers, if you would like to know how different parts of the Calculator app work, easily integrate Calculator logic or UI into your own applications, or contribute directly to something that ships in Windows, now you can. Calculator will continue to go through all usual testing, compliance, security, quality processes, and Insider flighting, just as we do for our other applications,” Microsoft said in a blog post.

The company is also publicly sharing the product roadmap for the app. Microsoft plans to improve the Fluent Design of the app and add the ability to pin Calculator on top of other apps, as well as new customization options this year.

You can find the project on GitHub here, and much like every other open-source project, you will be able to contribute to the project and if you are lucky enough, these changes could even ship with Windows sometime. Pretty awesome.

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Comments (27)

27 responses to “Microsoft Is Open Sourcing…Windows Calculator”

  1. Usman

    I am happy about this, the calculator app is so frustrating, having to manually select 'scientific' to put in brackets. compared to phone based calculators, it is very lacking, no carret/cursor support, no backspacing equations and god forbid you want to change a operator (+-x/ etc) but already typed in a number.


    I for one look forward to any improvement to it.

  2. martinusv2

    Hope they do the same with Mail and Groove.

  3. cp3822

    i think that would be really an additional bonus. As you know windows has already declined in market share. The fast grown Android outpaced them all. Thanks for the info.

  4. hoomgar

    I'm sorry but I almost spit my drink on my screen!  LOL!  :D


    "has been a major contributor in the open-source community as of late"

    "another major part"


    Huge news  LOL!


    "As developers, if you would like to know how different parts of the Calculator app work"

    You could get this, or any other of hundreds of free and open sourced calc apps.


    Stay tuned, they may be releasing Notepad next!  I can't wait!



  5. t.gill

    In reply to Greg Green...Wouldn't that be wonderful, then Windows could be just as big of a fragmented mess as Android is....

  6. Ekim

    Calculator? Really? That's the hello world of Windows programming.

  7. markbyrn

    Alright Linux fan boys, are you happy now?

  8. Greg Green

    They’re really starting small, aren’t they? Not what you would call courage or conviction.

  9. StoneJack

    MS should outsource Windows and Office altogether and become a server farm

  10. hrlngrv

    Since this was supposedly the same app on phones, tablets, PCs, maybe even Xbox and smart toasters, this may show MSFT's own take on UI code across multiple types of devices. In that sense, interesting.

    However, most days I have either Excel or GNU R up and running, so I have little need for the Calculator app. Very infrequent hexadecimal arithmetic is about the extent of my usage.

  11. skane2600

    They chose the wrong Windows calculator although I guess you open source the version that needs the most improvement.

  12. Stooks

    OMG!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  13. glenn8878

    They should open source Windows Phone. Maybe they'll win some marketshare in mobile devices.

    • Kevin Costa

      In reply to glenn8878:

      A good chunk of Windows Phone kernel and internals is shared with classic Windows (both run on NT). Open sourcing WP is open sourcing Windows, and I'm sure that MS is not ready for that yet...

      • glenn8878

        In reply to Kevin_Costa:

        That would be the bonus. Windows has already declined in marketshare. Android outpaced them all.

        • Kevin Costa

          In reply to glenn8878:

          Declined a bit (Android = 2B devices, Windows = 1,5B devices), but is still massive. MS wants stabilish itself as a cloud leader/reference before open sourcing its golden egg chicken. When most of MS revenue comes from cloud services, there is no reason to keep Windows a secret anymore.

  14. jules_wombat

    As one of the truly ugliest Applications, Calculator deserves complete rewrite, possibly with a proper dark mode.

  15. ggolcher

    Is this the beginning of open sourcing all Windows apps?

  16. bcalla

    Best calculator ever is still the Powertoy calculator. still run it in Win 10