A simple reverse polish notation calculator loosely based on my trusty HP-32SII.

RPN Calc 3.0 is now a Universal App that runs on both iPhone and the new iPads. The iPad version features a clean, elegant interface that is like holding a real calculator in your hands!

If you are familiar with HP RPN calculators, the operation of this calculator should feel straightforward. It can't be programmed and does not handle binary or hexadecimal.

It is however clean, simple and easy to use with all the required functions for quick calculations.