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Calc41C: RPN Programmable Calculator

By Watmough Software

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Calc41C is a modern looking reverse polish notation programmable calculator.

Calc41C emulates the venerable and much respected HP 41C calculator.


- Continuous memory, across closing the app,
- Numeric entry,
- Alphanumeric entry for functions and program labels,
- Numeric rounding,
- Transcendental functions,
- Trigonometric functions,
- Conversion between degrees, radians, grads,
- Conversion between hours minutes seconds and decimal hours,
- Polar/Rectangular coordinate conversions,
- Logarithmic and exponential functions,
- Basic statistical functions including mean and std deviation,
- Decimal/octal conversion,
- Program entry and editing,
- User assignable keyboard for built-in functions or programs


On-line manuals for the HP41C that are applicable to Calc41C can be found by searching the web for 'HP41C manual'.

Of course, actual printed manuals are also applicable, and may sometimes be obtained through auction sites and the like.


Calc41C is compatible with the iPhone and iPod Touch. Key-click will only be available over headphones on 1st generation iPod Touch models.

Sound (BEEP and TONE) are not emulated, though a key-click may be toggled by touching the status bar.

What's New in Version 1.1

★ Minor bug-fixes

iPhone Screenshot

iPhone Screenshot 1

Customer Reviews


This app works for the most part, but it is slooooow! Most problematic is that in hangs when executing user programs. The calculator app hangs, not the user program running on the app. Once the app hangs, nothing can bring it back. Not the app on/off switch, not killing the app on iPhone 5, not even resetting the phone by powering on/off. It seems to remember its state and always starts in the same hung state. This seems to happen when the app is context switched when executing a user program, or in program review/edit mode. An example of an app exit is pressing iPhone home button, or killing the app via double pressing iPhone home button. Very buggy!


Don't know about anyone else, but loved my 41C and finding it available for my iPhone was great. However, since upgrading to OS5 the app freezes. Will have to look elsewhere I guess.

Calc41C: RPN Programmable Calculator
View In iTunes
  • $0.99
  • Category: Utilities
  • Updated:
  • Version: 1.1
  • Size: 0.6 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 3.1.3 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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