Quick answer
Reverse Polish Notation Calculator
Simple fixed-point decimal arithmetic, Reverse Polish Notation calculator. RPN calculators may be in the minority but they are easy to learn and very efficient. The idea is that the operator follows the operands, so that instead of typing 2 + 2 =, one types 2 enter 2 enter +. The left arrow either deletes the last digit or drops the last item from the stack. The up arrow show a few other functions such as setting the number of decimal points, swapping items on the stack and the use of exponents.
How to install
- Download the APK from the button at the top of this page.
- Allow “Install unknown apps” for your browser or file manager only, not for every app.
- Open the downloaded file and confirm the installation.
- If installation fails with “App not installed,” remove an earlier build of the same app first. A signature conflict is the usual cause.
Data safety
- Every file is checked against its published SHA-256 before it is listed.
- Files are scanned for malware on every update.
- The permissions each app requests are listed on its own page.
- Read the full safety policy for how we test, flag, and delist files.
Frequently asked questions
What is RPN?
Reverse Polish Notation Calculator
Who develops RPN?
RPN is developed by ATH0.
Which Android version does RPN require?
RPN requires Android API 15 or later.
What is the current version of RPN?
The synchronized F-Droid version is 2.0.4.
Which license does RPN use?
The signed F-Droid metadata lists GPL-3.0-or-later.
Where is the source code for RPN?
https://github.com/lpar/RPN
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