rpCalc – graphical Reverse Polish Notation calculator

rpCalc is a graphical calculator that uses Reverse Polish Notation (RPN), a calculation method in which numbers are entered before the operations to be performed on them. It follows the approach used by many classic Hewlett-Packard calculators.

The calculator uses a four-level stack, with registers traditionally labelled X, Y, Z and T. Entering values and applying operators manipulates this stack, allowing intermediate results to be retained without repeatedly using parentheses.

rpCalc is designed for both keyboard and pointer interaction. Buttons can be clicked or tapped, while desktop users can enter numbers and mathematical operations directly from the keyboard. Commands can also be entered by typing their names, with completion available for partially entered commands.

The application provides additional views for calculation history and memory registers. Users can recall previous calculations, inspect stored values and configure the calculator’s appearance and display behaviour.

The interface is also available through a browser, giving users access to the same RPN calculation model without running a desktop application.

This is free and open source software.

Key Features

• Reverse Polish Notation with a four-level calculation stack.
• Keyboard, mouse and touch input.
• Commands can be entered by typing their names.
• Tab completion for partially entered commands.
• Ten numbered memory registers for storing values.
• Store and recall values using calculator commands.
• History view displays previous calculations in algebraic format.
• Memory view displays stored register values.
• Configurable number of retained history entries.
• Adjustable numerical display settings.
• Auxiliary display scaling for high-resolution screens.
• Desktop window size, position and title-bar preferences.
• Cross-platform support – runs on Linux, Windows, Android, and the web.

Website: rpcalc.bellz.org
Support:
Developer: Douglas W. Bell
License: GNU General Public License v2.0

rpCalc is written in Dart. Learn Dart with our recommended free books and free tutorials.

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