RPN Calculator
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Adds an RPN calculator as a browser action button.

This extension adds a convenient reverse Polish notation (RPN) calculator as a browser action button. Also called postfix, RPN calculators take their operators after the operands. For example, to get the sum of two and three on a normal calculator, you would hit "2 + 3 =". On an RPN calculator, you would hit "2 Enter 3 +". In general, RPN calculators require fewer keystrokes over a series of extended operations. It may seem strange at first, but once you get used to it, you'll never go back. HP made a series of extremely popular RPN calculators back in the 1970's and 1980's Known Issues: 1) Calculator doesn't automatically get focus when displayed. 2) Keyboard only. Clicking on keys and commands doesn't work.

5 out of 57 ratings

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Robert LoweSep 12, 2022

This is just the thing I needed! I use it when grading PDF documents in Canvas. I have been an HP calculator user from all the way back when HP was a good company. I had been using my trust 48GX for this, but it's overkill for adding up grades. It's much more convenient to have RPN entry directly in my browser, and this hits the sweet spot of the functions I need vs what is easy to use via keyboard. I really like the onscreen reference too!

1 person found this review to be helpful
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Jared M JohnsonJul 30, 2021

Great calculator, just wish I could copy/paste the input/output.

1 person found this review to be unhelpful


  • Version
  • Updated
    October 4, 2017
  • Offered by
    Mike Conca
  • Size
  • Languages
    English (United States)
  • Developer
  • Non-trader
    This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.


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