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RPNcalc+ free colorful web calculator
11-04-2020, 04:33 PM (This post was last modified: 11-04-2020 05:06 PM by radulle.)
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RPNcalc+ free colorful web calculator
Hello, my name is Nikola Radulaški, I'm from Belgrade, Serbia. At university during my structural engineering studies, 15+ years ago, I was in love with my HP49+ and how elegant RPN/RPL was. It has helped me tremendously and I am sure it would have been much harder to pass all those written exams if I were without it. Leather case might have degraded heavily but device is still functional and from time to time I still play around with it.
I wanted to pay homage to this beautiful device so I decided to make an accessible and fun to use web calculator so that I could teach RPN to my kids when they are old enough. I went a bit overboard and RPNcalc+ was born.
Reverse Polish Notation Calculator Plus (RPNcalc+) is:
  • RPN calculator (classical RPN with limitless stack)
  • free
  • open source
  • small (~50kB)
  • PWA (installable, works offline, standalone, mobile friendly)
  • colorful and fun to use
  • full keyboard shortcuts (hold F1 or ALT)
  • history of commands
deployed at and while code is freely available at
I really hope you take some time try it out, enjoy it and give feedback what should be improved or if you notice any bugs. My plan is to publish it also on Android and iOS stores when it is a bit more mature. Still, I think it is very functional as it is.
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RPNcalc+ free colorful web calculator - radulle - 11-04-2020 04:33 PM

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