RPN calculator

4.4
277 reviews
10K+
Downloads
Content rating
Everyone
Screenshot image
Screenshot image

About this app

RPN is a four function calculator designed to replace the standard Android calculator. It features large buttons designed for easy touchscreen use. It operates using Reverse Polish Notation, uses high accuracy decimal arithmetic internally, and has a fixed point scrollable display.

The code is open source and available at https://github.com/lpar/RPN

Found a bug? E-mail meta@pobox.com
Updated on
Aug 2, 2013

Data safety

Developers can show information here about how their app collects and uses your data. Learn more about data safety
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Ratings and reviews

4.5
260 reviews
Shannon Carlson
July 12, 2022
I love it. It's a simple RPN calculator that isn't obsessed with pretending to be an HP. It has all the functions that I use 99% of the time and for rare times when I need a more advanced function, I will likely be at my desk anyway, where I keep a genuine HP 32S. The stack isn't limited to four lines and I can see 12 lines of the stack all at once. It lacks a STO/RCL feature but it utilizes my phone's clipboard (copy/paste), which serves as a suitable substitute.
3 people found this review helpful
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Paul K
February 23, 2023
Almost perfect. Really good balance between buttons and "screen" space. "Undo" in the ellipses menu where copy/paste are would be really nice. Desperately needs a "roll" button. The backspace and drop buttons do the same thing after you hit enter. Just get rid of drop and replace it with backspace. Put roll where backspace was.
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Isaac Cutler
September 15, 2020
Best calculator app ever. It's simple easy quick and clean. The only rpn calculator I could find that holds more then 3 numbers in the stack. The addition of some trig functions would be nice, but I understand how that could compromise the simplicity of this incredible app.
5 people found this review helpful
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What's new

2.0.4 fixes a crash and allows raise to fractional powers.

2.0.3 tweaks font sizes when system font size is "Huge", to avoid a layout glitch.

2.0.2 fixes visual glitching on Galaxy Nexus running Jelly Bean (Android 4.1).

Version 2.0 added a redesigned Holo UI and requires Android 4 (Ice Cream Sandwich). It also added a square root function. Version 1.x is still available for older phones.