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

3.3 out of 5
12 Ratings
12 Ratings
secret agent 001 ,

Superb vintage calculator emulation

This is HP at its best. HP engineers created these unique RPN calculators. They are literally unique since no other major manufacturer used or uses RPN, thinking their customers are too lazy or unintelligent to learn how to use it. HP should be rewarded for creating the 15C and 12C apps. These are iconic brilliant tools worthy of their place in the pantheon of innovative human calculating machines. The manual alone is a gem, included in the app. HP wrote the best instruction manuals of any company around. Each example function illustrated by a real world computation based on physics or business needs, is literally a pleasure to read and work through. These are so easy to program you can get genuine time saving use out of these calculators. The real world versions are 10 times or more the cost of these apps. So stop complaining about cost and enjoy. Thank you HP.

Duncancol ,

I love it!

I was given an HP11C about 30 years ago whilst at college. Whilst RPN takes a bit of getting used to once I got comfortable with it the ease of completing complex calculations is extraordinary.

I still have that 11C but these days I keep it safe at home. I was so pleased to find that I could replicate it, plus a few extras, with this app. Even better, you get the manual as well which I have long since misplaced.

For me, they are the best calculators ever made by a some margin!

roddalitz ,

Excellent calculator with bugs

I own an old HP12 and am committed to RPN so I am delighted with this App.
I do have a problem with “landscape lock” which I think works fine if I have my iPhone free to rotate, but I keep my iPhone in portrait mode. HP15c landscape lock works if I select that first and then set my iPhone to portrait, but after sleep it goes back to HP15c portrait. Fiddly!
With such a high-class emulation, it is a shame for a detail to let it down.


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

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

More By This Developer

You May Also Like