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RPN Calculator 48

By Tom Kerrigan

This app is only available on the App Store for iOS devices.


RPN Calculator 48 is a polished RPN replacement for Apple's built-in calculator:

- Starts quickly
- Large buttons
- Easy-to-read display
- Same scientific functionality as Apple's calculator
- 100 entry stack (4 to 7 visible)
- 6 memory buttons (A-F)
- 50+ levels of undo/redo
- Saves state on exit

** Use swipe gestures to undo/redo operations!! **

The ergonomics (screen and keyboard layout) of RPN Calc. 48 were inspired by HP's outstanding 48-series calculator.

RPN Calc. 48 is made by the developer of tChess (the critically acclaimed iPhone chess game) and Learn Chess (the Apple Staff Favorite e-book).

What's New in Version 1.0.5

- Native support for the iPhone 6 and 6 Plus screen resolutions
- Fixes an incompatibility with iOS 9

iPhone Screenshots

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Customer Reviews


Most importantly, it doesn't do what you don't want to do. How novel!

I deleted my last RPN. Gave up. With that one they went thru great effort make it look EXACTLY like a 32s. Er uh- we aren't matching a set of seat cushions here. You needed a toothpick to hit each tiny little key. Also- who is going to do complex clacs on a hand held? If you're a student taking a test you can't. If you're a student at home you have your desktop or laptop. If you're an engineer, you're holding this thing in your had while the computer is doing the complicated stuff. Or you're at a job. You're going to solve a 3rd order poly equation out on a job holding this thing in your hand? No you go back to your car and use your laptop. Geeze! Don't app writers get out much?

Theses guys that designed this one kind of get it. A perfect product.

And you can set the keys to flash when you press them. That's the best idea I've seen in a long time. No looking back and forth to the screen to see if you pushed the right key.

And a settings window? Gee- why not make it like the 32s where you can't figure out anything without spending 30 min sorting thru a 200 page pdf copy of the manual? (written by the same guys that designed the program).

Thanks. You guys (the designers) made my week.

Just works

If you were an engineering major in the 90s, you will feel right at home. It loads super fast, the buttons are right size and math is accurate. Please optimize for iphone 6 PLUS users :)

On a side note, you should check out the developers chess app, one of the best out there for mobile

Lost without it

Been using this for years now. It's one of a few apps that I immediately install on any new phone. Since becoming addicted to RPN in college, I can't use regular calculators. Thankfully this high-quality app exists! I can't remember what I paid but whatever it was, it was well worth it.

RPN Calculator 48
View in iTunes
  • $3.99
  • Category: Utilities
  • Updated:
  • Version: 1.0.5
  • Size: 0.7 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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