100,000 - 500,000 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.

Tags: rpncalc, rpn calc.apk, hp35s, droid48 apk, rpn calc, rpncalc 2 apk, rpn calc apk, rpncalc pro, rpncalc apk, calc apk.

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
  • (53 stars)

    by Tony Ho on 25/05/2014

    Should adopt "long press to activate shift-function" like some competitors do. STO and RCL should list out memory registers.

  • (53 stars)

    by Carlos Nicolini on 12/05/2014

    Very professionally made with a familiar interface and the glories of reverse Polish notation. The only thing I miss is a programming language. But it's a free app so 5 stars out of 5.

  • (53 stars)

    by John Melcher, Jr on 04/05/2014

    Used this one for years. Works well.

  • (53 stars)

    by Michael Teetor on 21/04/2014

    Great application I use it because it is easier than the ones that have the equal signs.

  • (53 stars)

    by Casey McMichael on 09/04/2014

    Good show... Thanks

  • (53 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!

  • (53 stars)

    by Joseph DiPietro on 15/03/2014

    So much like my 35s I've started leaving the hp at my desk and using this app when in the field.