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Simple RPN Calculator

By National Spork LLC

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Simple RPN combines the most essential RPN features with the same stack behavior found in HP calculators. The calculator works in either portrait or landscape mode, supports international number formats, and has continuous memory for all registers. In addition to the functions shown in the screenshots, you can choose the number of decimal places to show by pressing [ f ] + [ any number ] and use the ten storage registers by pressing [ f ] + [ STO ] or [ RCL ] + [ any number ].

This calculator is a labor of love that I created to suit my tastes, and I use it every day. Every aspect of it, from the operational logic to the graphic design, has benefitted from meticulous attention to detail. Enjoy the RPN goodness!

What's New in Version 1.3.1

Fixed point mode is fixed.


iPhone Screenshot 1
iPhone Screenshot 2
iPhone Screenshot 3
iPad Screenshot 1
iPad Screenshot 2

Customer Reviews

Wow, they fixed it!

Revised review: The best RPN calculator for the iPad no longer makes the world's most irritating noise when you hit a key. It still has that simple design and all the functions you really need. It's even elegant, like an eighties Braun. It works perfectly and is my favorite calculator app ever!

App doesn't work!

I purchased this app and downloaded it. When I opened it it came on and then shut down in about 2 seconds. I've tried several times and the same thing happened. I rebooted my iPad and it didn't help. Until the developer fixes it, it is useless.

The click sound is awful

I bought this app and the first time I used it my wife told me to "knock it off"...the key clicks were bugging her. Todd, buddy. Please give us the option to lose the clicks :)

Simple RPN Calculator
View in iTunes
This app is designed for both iPhone and iPad
  • $0.99
  • Category: Utilities
  • Updated:
  • Version: 1.3.1
  • Size: 6.1 MB
  • Languages: English, Danish, Dutch, Finnish, French, German, Italian, Japanese, Portuguese, Russian, Spanish, Swedish, Turkish
  • Seller:

Compatibility: Requires iOS 4.3 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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