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rpnCalc is a reverse polish notation (RPN) calculator. The stack behavior is based, rather loosely, on the HP-28S. I originally wrote it because the battery on my HP-28S died and I needed a calculator. Yes, I suppose I could have bought a new battery. But instead I wrote an HTML/Javascript/CSS RPN calculator; partly out of need, and partly as an exercise in Javascript.

What's New

Version 1.6.1:
  • Fixed a bug whereby if a HEX value contained a single 'E' and no other non-numeric characters, it was being converted to a exponential number.


Mac OS X 10.4 or later

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5 2


Current Version (1.x)


Downloads 6,756
Version Downloads 2,848
License Free
Date 15 Dec 2006
Platform OS X / PPC 32 / Intel 32
Price Free
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