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RPN Calculator is a simple but powerful RPN calculator for MacOS with a scalable interface via selectable function palettes. This calculator is one of the only mac calculator programs that handles complex arithmetic.

What's New

Version 1.9 adds the following:
  • Removed erg from the "Moment of Force" category. Fixed bad unit factor for erg.
  • Returned the decimal key behavior back to its original state.
  • Improved the RPNC log a bit.


Mac OS 8.1 or later

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RPN Calculator User Discussion

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corvus@sbcglobal.net Member IconReview+0

FYI, my version 1.82 of this little gem runs on my OSX machine without an emulator. I’ve used it for so long on so many platforms that I'd forgotten its origin. Out of curiosity I just checked the “About” box and was reminded that it’s a Classic app over 11 years old – surely the only one in my Intel/10.6 machine!

The File menu and CMD-W don’t work, but CMD-Q works, which is good enough, and all the functions and windows work just fine.

I wonder if Rev 1.9.2 would run under OSX, and, for that matter, if anyone’s running any other Classic apps under OSX without an emulator. (?)

Reply0 replies
Version 1.9.2
Monterey Gardiner Member IconComment+0
Monterey Gardiner

Great Program, Does anyone have his current website where a donation to him can be made? I did not see anything in the download package or in the program it's self. I will try sending him an email.


Reply1 reply
Version 1.9.2
Jeff Baker (Developer)

New RPNC web site:

Thanks for your support!

John178 Member Icon+0

I've always been a fan of RPN and have followed the development of this program for several years. It is outstanding and worth much more than $8. It out performs my original HP 35 which cost $395 30 years ago.

Reply0 replies
Version 1.8.9
rtdixon Member Icon+0

Wow! What a fine, fine piece of work! And it just keeps getting better with every release. Furthermore, get this: IT'S FREE! It surpassed a $60 piece of software I used to rely on about three releases ago. Very stable and programmable too.

Highly Recommend!

I just wish I could think of a feature or two to request...

Thank you very much for your hard work, Jeff!

Reply0 replies
Version 1.3
fletcher Member Icon+0

Well, I haven't done a "full test" of the calculator yet, since I just downloaded it, but on my first inspection it looks pretty darned good! Lots of scientific calculator functions, a nice option to show sets of keys or hide them if you aren't going to use them, and personally I'm a big fan of RPN.... In addition, it appears that the author is putting a lot of energy into making this calculator stable and accurate. If it isn't exactly perfect now, then I'd be willing to bet it will be soon.

Plus, I hate to even mention this, but... for the love of pete, it's *free* !


P.S. My ratings for ease of use and stability are conservative since I haven't really *used* it.

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Version 1.2.1
Anonymous Member IconReview

This is GREAT!!!

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Version 1.0.3a
There are no Ratings for this App yet.
> 5 2


Current Version (1.x)


Downloads 8,746
Version Downloads 1,440
License Shareware
Date 04 Sep 2003
Platform OS Classic / PPC 32
Price $8.00
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