The RPNcalc 15 is a full featured high end scientific RPN calculator with support for complex numbers and matrix math.

All Features: at a glance:

• Display & Keyboard:
∙ Fixed number format
∙ Scientific number format
∙ Engineering number format
∙ Backspace

• Math:
∙ +, -, ×, ÷, %, 1/x, root, x^y, pi, ln, log, e, ...and many more
∙ Integer truncation and absolute value
∙ Trigonometric and inverse trigonometric functions
∙ Hyperbolic and inverse hyperbolic trigonometric functions
∙ Trigonometric modes (degrees, radians, grads)
∙ % change

• Advanced Math:
∙ Solver / root finder
∙ Numeric integration
∙ Complex numbers
∙ Matrix operations

• Statistical:
∙ Mean standard deviation of 2 variables
∙ Summation
∙ Random number generator
∙ Linear regression
∙ Correlation coefficient
∙ Factorial
∙ Gamma
∙ Combinations and permutations

• Scientific and Time:
∙ Polar and rectangular conversions
∙ Decimal hrs / hrs.min.sec. conversions

About RPN:
The Reverse Polish Notation is a mathematical notation in which operators follow their operands. It does not need any parentheses as long as each operator has a fixed number of operands.

What’s New

Version 2.1

- macOS Mojave support
- Miscellaneous bug fixes and stability improvements

Ratings and Reviews

3.2 out of 5
9 Ratings

9 Ratings


Missing reverse side

Missing the reverse side of the 15C, which contains some very important programming information. How about making it a part of this app that can be easily referenced from the drop menu. Otherwise, I'll hav.e to copy it to my desktop as a jpg.

Ninja baby123 ,

Rough around the edges on modern Mac

I love the old 15c, and though this version is very inexpensive and generally functional, it is a bit rough around the edges. The graphics definitely need to be upgraded for the retina display - I find this is quite “blocky” from displays to key graphics. The other surprising thing is that it is noticably slow. I’m not sure if this is due to running on Yosemite, or if it is not sufficiently optimized, but operations that I can run on the Apple calculator and then compare to this version of the 15c (like raising a number to a double digit power) take noticably longer here. Doesn’t keep me from using it, but definitely something to be improved upon.

Dhjdhj ,

I think it's great

Having owned many HP calculators, I think they've done a great job with this one, and it's nice to be able to use it with the regular Mac keyboard.

I wish they would do an HP-16

App Privacy

The developer, bitPUNCH, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

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

More By This Developer