RPN Calculator is a calculator that uses the Reverse Polish Notation method of user interaction, which is typically popular with people who deal with financial, engineering or other technical problems. See http://en.wikipedia.org/wiki/Reverse_Polish_notation for details if you are not familiar with this style of calculator.

This calculator is designed to be functional, expandable and easy to use. It has a 6 level stack, all of which are visible (5 visible plus input stack during input) at all times. Many of the most useful functions are included like Roll Up and Roll Down, XY Swap, log, ln, e^x, Trig functions and their inverses, exponentials. The calculator will also allow you to display your data in FIX or SCI notation, and will allow you to specify the number of digits to display.

Amortization calculations are provided. Solve for loan amount, payment or number of payments.

Units conversion for popular units of length, weight, volume, speed, temperature and pressure are included. New in version 2.4 - Area conversions per user request.

New in version 2.5 - handle the case of Cos(90) which was returning an approximate value instead of zero. This was due to inherent approximation of PI during conversion to radians.

STO and RCL are now supported due to customer request.

Added support for European decimal display (space as separator and comma for decimal separator) - depending on phone culture setting.

All data is persistent if the application is backgrounded or exited.

More functions can easily be added based on user requests