Dozecal

Dozecal

Duodecimal calculator

4 ratings
4 reviews
Free

Details

  • Released
  • Updated
  • July 2, 2020
  • August 10, 2025

Features

Dozecal screenshot #1 for iPhone
Dozecal screenshot #2 for iPhone
Dozecal screenshot #3 for iPhone
Dozecal screenshot #4 for iPhone
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About

This educational calculator promotes the use of Base Twelve (duodecimal) in math and science. It offers standard mathematical functions in both duodecimal and decimal modes, with automatic conversion between them. It utilizes Reverse Polish Notation (RPN) for calculations.

Duodecimal and Decimal modes
Automatic mode conversion
RPN (Reverse Polish Notation) input
Standard math functions
Trigonometric operations (degrees)
Educational tool for Base Twelve
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What's New in Dozecal

1.0.9

August 10, 2025

Some minor bug fixes

User reviews

Makes duodecimal Easy to understand

I have been very interested in the base 12 system for a number of years now and I am very pleased there is a calculator app for it now. Very well thought out you can switch between the decimal and duodecimal modes.

Really cool!!!!

I’m learning dozenal at the moment and your calculator is pretty intuitive to understand, it’s neat learning RPN at the same time

Another Excellent Improvement

Great improvement in readability of fractional Dozenal numbers between 0 and 1! Going immediately to scientific notation for numbers between 0 to 1 made them difficult to read. This most recent update fixed that!

Next suggestion: Implement DSA font options for Dec and El (Pittman, Dwiggins, or both) in the display area?
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Interesting

Has novelty value!
I get the feeling this is a 'work in progress', so I look forward to seeing how it develops.

Unfortunately, although the display rotates it does not resize for landscape view, meaning part of the keypad is missing and the readout is not visible at all!

…Reverting to portrait mode:
Stack behaviour is a bit odd: results are not automatically put into the X register, thus requiring an extra tap on the 'Enter' key to get them there.

Also, the keys themselves do not always register a hit, so watching the readout becomes a priority — and it's easy to make irretrievable errors.

It seems its most practical purpose is as a base10 / base12 conversion tool. However, I do like the concept and it comes without adverts, for free. Highly commendable!
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Developer apps

FAQ

What is Dozecal?

Dozecal is an educational RPN calculator designed to promote the use of the duodecimal (Base Twelve) number system in math and science. It supports calculations in both duodecimal and decimal modes with automatic conversion.

How does RPN work in Dozecal?

Dozecal uses Reverse Polish Notation (RPN), where numbers are entered first, followed by the operation. For example, to calculate 3 + 4, you would key in '3 ENTER 4 +'.

Can Dozecal convert between decimal and duodecimal?

Yes, Dozecal automatically converts numbers when you switch between duodecimal and decimal modes, making it easy to work with both systems.

What devices does Dozecal support?

Dozecal is available for iPhone, iPad, and iPod devices, indicated by its support for these platforms.

What is the age rating for Dozecal?

Dozecal has an age rating of 4+, making it suitable for a wide range of users, including younger learners.

How often is Dozecal updated?

The latest version of Dozecal is 1.0.9, and it was last updated on August 10, 2025, suggesting active development and maintenance.

Does Dozecal have ads?

No, Dozecal does not contain advertisements, providing an uninterrupted user experience.

Where can I learn more about Base Twelve?

For more information about Base Twelve, the app suggests visiting the Dozenal Society of America website.