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 2.1.2

64 bit support

Ratings and Reviews

3.7 out of 5
156 Ratings

156 Ratings

AI Architect ,

Data Scientist

We need an iOS compatible upgrades from HP soon!!

I've used HP calculators most of my life, since my first HP67 in 1980. I still have it. I have many others: 34C, 11C, 12C, 15C, 41CV, 48GX. No other calculator type, has ever surpassed the HP family. EVER. I prefer to use the real ones only occasionally now, because there are no more replacement parts.

However, The emulators for the iPhone are so nice to have and I use them regularly, and they're all in my pocket on the iPhone 6s+. Phone size is about the actual size of the real machines too. I love em.

HP needs to update the 12 and 15 soon though. Apple says they are not compatible with future versions of iOS. Other developers are keeping up with their HP emulators, some of which are very nice.

I think HP would have a profitable business unit if they took seriously bringing these great little computing machines back to life in the whole family of reasonably priced emulators.

However, for now, is be grateful if they would just ensure their existing emulators are compatible with future iOS versions.

Kindest Regards,

Skip waterman ,

HP calculator enthusiast

This is a superb emulation of the original Hewlett-Packard HP 15C calculator. I should know. I had an HP 15C when it was new. It took me through physics and calculus in college and the start of my engineering career.

Regretfully a trip though the washer and dryer in the pocket of a jacket killed that calculator. I have bought and used other calculators but the 15C has always remained my favorite. When I saw this app, and it was made by Hewlett-Packard, I did not hesitate to purchase it.

Reports the the app does not work with the latest iOS are out of date. Hewlett-Packard updated the app and it works flawlessly. As of this review I am using iOS 12.1.4.

Fotohead ,

I love It July 2015

I put the date I purchased it here since I know there must be a lot of versions. I have tried every RPN calculator out there. I like this one the best. The horizontal is a perfect rendition of the classic calculator. In Vertical the choices were made perfectly. A reciprocal key and a square root key are the only functions. Both of these are handy for quick calculations I make in vertical mode. Also the keyboard area is not cluttered with ads or even settings. To change the FIX for digits you must go horizontal. The elegance and simplicity are ideal.


HP Inc.
25.9 MB

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



Age Rating
Rated 4+
© 2012 Hewlett-Packard Development Company, L.P.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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