RPN 28x Calc

Math can be fun.

Go to the App Store on iTunes

RPN 28x Calc in action

High Precision Arithmetics

Supports numbers with up to 38 significant digits.

Multiple Data Types

Real numbers, binary numbers, lists, arrays or vectors, names, and strings.

Interactive Stack Display

The display expands to see up to 16 levels at a time. You can easily scroll through and select your entries.

RPN 28x Calc

RPN 28x Calc is a scientific calculator with a dynamic stack display. It uses reverse-polish notation (RPN) for its operation.

As you add more values to the stack, the display automatically expands. To see more lines, simply swipe to scroll. You can also re-order the levels or modify any of the values on the stack.

RPN 28x Calc reorder example

Variable viewer of RPN 28x Calc

New Variable Viewer

You can browse all variables in a separate viewer. To make a variable available to a command, simply select it in the viewer and issue the command. Double-tap a variable to edit it.

Command & Results History

Select "Log" to display your command history. To place a value back onto the stack, double-tap it. Swipe upwards to reveal a panel of action buttons, i.e. to delete entries or to share the log.

Command Panels

The side panel has a keyboard and three pages of commands. You can swipe across the panel to navigate between the pages.

Work With Operands

Tap an operand in display to select it. Then issue a command on the selected operand.

User Guide

From the info menu within the app, you can download the user guide with an introduction and a command reference.

Download PDF

RPN 28x Calc screenshot

Multiple Undos

You can restore previous stacks with the UNDO command. Using LAST you can get back the most recently used operands.

Landscape Orientation

When you rotate the iPad, RPN 28x Calc re-adjusts its layout to fit the available screen area.

No Ads

No interruptions. RPN 28x Calc does not display ads. There are no rating requests.

RPN 28x Calc
RPN 28x Calc

iPad $2.99
Version 2.2.1 (603)
8 January 2016
Languages: English

iOS 8.4 or later.

Tested on iOS 8.3.

Latest News

Beta-testing of the next version is now closed.

Version 2.1 adds action buttons to the command log. New command: ≠ and aliases: CHS, SQRT, and ==.

Version 2.0 adds a log and variable viewer.

Plans for future versions

  • User-definable buttons.
  • Support for programs.
  • Complex numbers.
  • Matrices, i.e. arrays within arrays.
  • Arithmetic expressions.

Also Note