RpnCalc - Rpn Calculator

Fantastic RPN Calculator - Now I can have my beloved HP style RPN calculator with me at all times.

Clear and All Clear do the same thing. Needs to be fixed.

Excellent RPN calculator. Would love to see one like my trusty HP 15C

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Lovely little rpn calculator.

RPN rules. Thanks!

works quite well, would be nice to have button feedback...click

Fast, elegant and functional. Three thumbs up!

Very good.

perfect simplicity

Hello. I am missing the "arrow to left" button. If i input wrong i can only delete everything (and all stacks) with the "C"lear key. The "arrow to left" button allows to make correction to input on last stack :( I can see that button on the screenshot on APP page tho?

Elegant, reliable, easy to use, what more could I want? A slightly larger font in the entries and results display area would be nice but that's a minor quibble only.

Simple, excellent, and much like the HP-15c I used 25 y. ago. However, those unfamiliar with HP's RPN implementation are apt to find this app baffling.

I can't believe I waited this long to look for an RPN calculator app as it's the style of entry I prefer. Does everything I need! The only thing I'd change is a wider dash for the subtraction operator key label. ????????❕????????

It would certainly be more than three stars if the display font size could be adjusted and if there were a little bit of padding around the display. It's not easy to find the numbers quickly.

Update after a year of use: this app is still just as awesome as I said in my initial review. Nothing wing with it, everything is right with it. Original review, June 2016: Awesome app. Does almost everything my old HP 32SII does (except programmable functions). Yet it also does more - like letting you view the tape of your string of calculations and then share that via email, etc. Simple, reliable, just works. I can hardly believe that such a great app is not only free, it's also free of ads and doesn't harvest your personal data. Hats off to Mr. Falk for this selfless contribution to the world of number crunchers.

My 41c, 11c and 15c have been collecting dust since I've installed this application.

This is the best calculator app, except for the real thing! Most Android apps don't come close to the quality and efficiency of this one.

Oh to have my P2R and R2P functions again is just awesome! RPN is not dead! Thanks for making it free and without ads! So cool.

urr gwurr why the numbers go wrong way

the ENTER key plays a significant role among all others. it should be colored differently now that tactile distinction is not an option.

Clean and easy like a calculator should be. Seeing entire stack is nice.

I liked this application, it was the best reverse polish application i could find, and it's pretty good, but it could be improved. I like the fact that it has a basic mode and scientific mode and can can go back and forth easily. Ok, here are things that can be improved: First off, it's really sleazy how it asks you to rate it, and then only gives you a choice of love it, or has problems, and will only send you to google to rate it if you first say you love it. Come on! you dont have to resort to that. Th

Great app! It doesn't matter which way your screen is oriented, the app accommodates it. I don't need graphing so this is fantastic for me (no fashion school bs). I'd still be using my HP-45 if HP had designed a more rugged display system.

RPN may seem awkward at first, but it works more like our minds, it's faster and more accurate than conventional calculators. Great app! I am disappointed that RPN is not taught. It's far superior than the traditional calculators.

Awesome app. Does almost everything my old HP 32SII does (except programmable functions). Yet it also does more - like letting you view the tape of your string of calculations and then share that via email, etc. Simple, reliable, just works. I can hardly believe that such a great app is not only free, it's also free of ads and doesn't harvest your personal data. Hats off to Mr. Falk for this selfless contribution to the world of number crunchers.

This calculator is one of the best i've seen. One query though, can't work out how to use the 'frac' button. Cool, I should have worked that one out, tganks.

It keeps getting better and better with each upgrade. I use it all the time.

Awesome calculator. Use it daily in my job .... mine surveyor. Hasn't let me down once.

Almost exactly the same as my trusty HP 11 - except better as it shows the stack and has a tape record of everything. Excellent!

There doesn't seem to be a way to swap items on the stack. Otherwise seems good but I think that's a major omission.

I have very few apps that I place on my home screen. This is one of those apps. Best calculator app out there.

I have downloaded all of them including ones i paid 10 bucks for and one for 17 bucks.. This one is the best.. I am a surveyor and this is the one i use

I have been using this app for at least three years and absolutely love it.

It would be good if the key indicator above would flash briefly to show that the second function was indeed pressed.

Back in the 70s many contest was won by HP calculators. Thanks for thus app. I'll teach my grand children how logic works!

Easy to use and stable (unlike EMU-48 which crashes all the time)

I've installed this free app on every smartphone and tablet I've ever owned over the years. Always "just works" flawlessly. Thanks!

I've used this top-notch app for years.

This is by far the best app for surveyors that used the old hp11 & hp15.