RPN9

Flavio Ribeiro

About this app

RPN9 is a full-featured RPN (reverse Polish notation) scientific calculator. It is designed for engineers, scientists, college students and advanced high-school students.

RPN9 features circular, hyperbolic and complex trigonometry, probability and statistical functions, complex arithmetic, unit conversions, rational approximations, base conversions, logical operators, configurable display modes and non-volatile memory. RPN9 includes reference documentation.

Ratings and reviews

Works kinda well. Nice RPN and extra stacks are useful. Buttons are too large and obscure the shifted functions. Base calculations are useful and easy to use. The C button to clear does not work on the entire stack but only while entering a new number. I cant find how to set to degrees mode. Trig functions are in radians. I can or scroll the display to see older values in the stack. The stack is of infinite size. Can it be set to a Maximum value?

I had a TI in high school ('79-'82), but I recall those few who had the HPs. (They never had to worry about anyone asking to borrow them ;)) I learned RPN in University when I took Computing Science. This is the first HP calc I've actually liked... takes a bit of getting used to.

Excelent calculator. precise, intuitive and easy to use.

What's new

Targeting Android 12 (SDK 31)