Dozenal Calculator App for Android Smartphones and Numworks Beta Firmware Version 25
Dozenal Calculator App for Android Smartphones
The Dozenal RPN Calculator app is by Unum Designum for the Android smartphones. It is a classical, four-level stack RPN (Reverse Polish Notation) app that operates in both dozenal (i.e. duodecimal, Base 12) and decimal (Base 10). The calculator app features a standard set of scientific functions:
* arithmetic, square, square root
* sin, cos, tan, and inverses
* e^x, 10^x, ln, log
* DMS/Decimal conversions and HMS/Hours conversions (not sure how there are two sets, since they seem to do the same thing)
* Pol/Rect conversions
* percent function (%)
* Stack functions: roll down, roll up, swap, last x
Originally Released: July 1, 2020
Last Updated: December 17, 2025 (as of January 22, 2026)
Version I am reviewing 1.0.11
The polar/rectangular conversions follow the conventional RPN calculator format:
|
Rectangular |
Polar |
Y Stack: |
Y |
Θ |
X Stack: |
X |
R |
The percent function follows the conventional RPN calculator format:
|
Before |
After |
Y Stack: |
Y |
Y |
X Stack: |
X |
Y * X ÷ 100 |
However, the decimal/DMS (decimal-minute-seconds) and hours/HMS (hours-minute-seconds) follow up this format:
|
Decimal/Hours |
DMS/HMS |
Z Stack: |
0 after conversion |
seconds |
Y Stack: |
0 after conversion |
minutes |
X Stack: |
decimal/hours as a decimal |
decimal/hours |
Conversion between bases is just a matter of pressing [ f ] [ DOZ/DEC ].
Symbols:
* Upside down 2 (↊) represents 10 (Unicode 218A); commonly symbolized by X
* Backwards 3 (↋) represents 11 (Unicode 218B); commonly symbolized by E
(Unicode is from Wikipedia: https://en.wikipedia.org/wiki/Duodecimal)
Two constants provided by the Dozenal RPN app:
|
Base 10 (e: 10^n) |
Base 12 (e: 12^n) |
π |
3.141592653589793 |
3;184809493↋9186459↊↊ |
Planck |
6.6206070149999999e-34 |
1;↊79611175↊0925342846e-27 |
App information: https://play.google.com/store/apps/details?id=dozecal.unumdesignum.com&hl=en_NZ#/
Numworks: Beta Firmware 25
Version 25 Information: https://www.numworks.com/calculator/update/version-25/
Nuwmorks has released a firmware update 25.1. It is a beta version software where new features are tested. To try it, Numworks is inviting Numworks users to download and become a beta test or us the beta emulator on the Numworks website.
Verison 25 Beta Emulator: https://www.numworks.com/calculator/update/version-25/
Please keep in mind that this emulator is probably only available for the testing period and may become unavaiable once the official release is made.
Major updates include:
* Data in the Statistics app can either be qualitative (data points, the way the statistics mode was always used) or categorial (data points always belong to specific categories, up to 10)
* The Grapher app can shade area of intersection for a given set of inequalities.
* The Grapher app also finds intersection points of conic sections and vertical lines.
* In the Calculations app, results with five or more decimal place will have at least a fractional approximation in the Additional Results quick tab.
* The degree and radian symbol/indicators are added to the Toolbox.
* Sequences have new notations.
* Installing this version will limit roll back deinstalls to versions 24.11 or later.
No word on any additions or changes to the Python app.
I have installed version 25 on my older Numworks calculator (N0110) so I can try them out.