Bring your nostalgic fondness for the HP 15c Scientific Calculator to your latest iOS devices with the authentic HP 15c calculator app from Hewlett Packard.

This RPN calculator offers the features, algorithms and calculation sequences of the original 15c Scientific Calculator conveniently stored on your iPhone, iPad or iPod Touch.

• Authentic app, developed by HP
• Award-winning HP Support
• Identical algorithms and calculation sequences as the original HP 15c Calculator
• RPN data entry
• Matrix calculations
• Complex functions – real and imaginary
• SOLVE key find the root of an equations
• Numerical integration
• Ideal for math and engineering students and professionals
• Programmable – up to 448 lines

What’s New

Version 2.3.2

Bug Fixes

Ratings and Reviews

3.6 out of 5
18 Ratings

18 Ratings

CTFavetta ,

Good app. Needs tweaking.

The app is good though a little bit pricey when considering that there are far more powerful calculator apps that are less expensive. (HP is preying on the sentimental engineer who misses their HP15C)
The following improvements will be appreciated:
1) Expand options behind the "Menu" icon to include the following:
a) Link to App developer support. (How hard would that be?)
b) A switch to turn off key press sound feedback so that the user doesn't annoy their co-workers or people trying to study in a library.
c) Turn off the blinking after providing the calculated answer given after using a programmed set of functions. (The blinking answer keeps blinking at you and it annoys the blinking blinking out of the user)

SDC Sydney ,

Update needed- and deserved, at this price

Good replica - but not yet upgraded for iPhone6 - nor even ios9.
Main screen just a little too small on my phone, with borders in landscape- if it filled the whole screen it would be much more usable.
Manual uses old style buttons, not iOS 9.
I like it- but was not worth the $ I paid. Next time I'll try a 3rd party copy.

kev61 ,

Back up to date

A few improvements over the older version, not least of which is the quieter key click sounds. I was dreading the thought of losing the 15c, I can upgrade to iOS 11, now.


HP Inc.
26.9 MB

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



Age Rating


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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