50,000 - 100,000 downloads

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RpnCalc is the best and most popular RPN calculator on the Android Market.

It has an interface that users of the HP calculator line will be completely at home with, including these features:
Scientific mode
Basic (large key) mode
20 Memories
Key click (haptic feedback)
Continouous memory
16-level stack
Front four stack elements displayed
Memories are not sacrificed to make room for program steps
RpnCalc has a sixteen-level stack to hold more data. The front four elements on the stack are visible at all times, making it much easier to keep track of where you are in your calculations.

See http://www.efalk.org/RpnCalc/ for manual

Oh, and here's the privacy policy: RpnCalc never collects any private data of any sort. It never connects to the internet. It doesn't even run ads.

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Recently changed in this version

Version 2.19 Fixed bug when user enters too many digits

Version 2.21 changes the way the app remembers keyboard layout. There should be no visible change, but it will prevent bugs in the future when layouts change.

Version 2.20 died with a "class not found" error. Probably a compilation problem. Users who installed 2.20 should immediately install 2.21

Comments and ratings for RpnCalc
  • (70 stars)

    by Casey McMichael on 09/04/2014

    Good show... Thanks

  • (70 stars)

    by Eduardo Capocchi on 01/04/2014

    After fixing a data entry bug, this is now my default calc app. Fast, elegant and functional. Three thumbs up!

  • (70 stars)

    by Viola Forrester on 19/02/2014

    Love this simple rpn calculator that can be in basic or scientific mode. Best of all, it's free for what you get.

  • (70 stars)

    by R Amavisca on 01/02/2014

    No need to dig out the HP calculator with this app. Works well too. With RPN, you can start anywhere to do the calculation.

  • (70 stars)

    by Brian Nordin on 15/01/2014

    ...I prefer the HP48G app much more.

  • (70 stars)

    by Annie Mous on 09/01/2014

    Works great!

  • (70 stars)

    by George Lasic on 06/01/2014

    Great app! I use it all the time.