Dozenal Calc

1.5.1

steinerschüler

0.00

0 reviews

10+
Downloads

Free

A "dozenal calculator" with a novel notation for numbers.

Download from Google Play iOS version

About Dozenal Calc

Dozenal Calc is a tools app developed by steinerschüler.

Download Statistics

Dozenal Calc has been downloaded 17 times. In the last 30 days, the app was downloaded 6 times.

User Ratings

The app has no ratings yet.

App Information

Dozenal Calc is FREE to download. The APK download size is 28.18 MB. The latest version available is 1.5.1. The last update was on June 13, 2026.

Technical Requirements

The app has a content rating of Everyone. The app has been available on Google Play May 2026.

Description

A "dozenal calculator" — a scientific calculator that counts not in ten, but in twelve. With its own symbols for the digits.

What base 12 can do that base 10 cannot

In decimal, 1/3 is an infinite repeating fraction (0.333…). In base 12 it is short and exact: 0.4. Sixths, ninths, and every fraction whose denominator is built from twos and threes become finite in dozenal. This is no accident: twelve has six divisors, ten only four.

Dozenal Calc runs an exact rational track in parallel with ordinary floating-point arithmetic. Repeating fractions are shown with a bar over the repeating digits, just as taught in school. Example: 1/7 appears as 0.186A3 with a period bar, followed by raised dots when the period exceeds five digits.

Feature set

• Basic arithmetic + parentheses + signs
• Power, square root, nth root
• Logarithm to any base
• Parallel addition (a⊕b = ab/(a+b)) — useful for resistor circuits
• Trigonometry (sin, cos, tan, cot) and their inverses
• Hyperbolic functions (sinh, cosh, tanh, coth) and their inverses
• Constants π, e, φ, √2
• Factorial, absolute value, reciprocal, modulo
• Memory (STO/RCL/MC) with exact rational round-trip preservation
• Angle modes DEG / RAD / GRAD (default: DEG)
• Double-tap function keys switch to the inverse (sin → sin⁻¹)
• Numeral-system switch in the settings: input AND result in base 12 or base 10, with automatic conversion — applies to both calculators
• Light and dark theme
• First-launch operating intro — re-openable any time via the (?) button
• Fourteen languages with a picker in the info menu: Deutsch, English, Français, Español, Italiano, فارسی, Русский, Gaeilge, हिन्दी, 简体中文, 繁體中文, Cymraeg, 日本語, العربية

Unit converter

One swipe to the left opens the second calculator: it converts imperial and metric units into one another — length, area, volume, weight, time, angle, money (£/sh/d), temperature and more. Compound entries like 3 ft 5 in, breakdown into part units, and math right inside the entry (× ÷ ⊕ ^ √ ㏒) with memory and constants. Results travel between the two calculators at the press of a key. A color code keeps the worlds apart: green for the world of ten (metric, base 10), violet for the world of twelve (imperial, base 12).

Theory and manuals

Two illustrated manuals explain both calculators step by step. A richly illustrated reader then shows, in three blocks, why twelve in particular is a special number:

• Twelve and the World — from the dodecagon and dodecahedron through crystals, viruses and quasicrystals to music, art, architecture and the calendar
• Dozenal Mathematics — divisors and periods, the number bases compared, a history of place-value systems
• Dozenal Society — the movement for twelve, new digits for ten and eleven, the TGM measurement system

Many chapters show public-domain historical illustrations with tappable source citations. Plus a unit theory on measure and number, and recommendations for dozenal-friendly calculators on every platform.

What Dozenal Calc does not do

• No ads
• No tracking
• No analytics
• No internet connection
• No permissions — the app requests no camera, microphone, location, storage, or any other access
• No personal data

The app works completely offline. What you type stays on your device.

Whom is it for?

For teachers who want to show how a different number system would change everyday fraction arithmetic. For students who want to see their mathematics from an unfamiliar perspective.

License: MIT License
Contact: dozenal@weltanschauung.app

Recent changes:

New in 1.5.1:
• Decimal numbers and familiar digits by default — dozenal (base 12) and the custom glyphs can be enabled anytime in Settings.
• New round, colorful menu icons; the app name now appears in the menu title.
• New "Font size" setting, especially for tablets.
• Unit converter: change the unit without "All clear".
• Reworked, shorter introduction.
• Slightly smaller app.

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More data about Dozenal Calc

Price	Free to download
Total downloads	17
Recent downloads	6
Rating	No ratings
Ranking	Not ranked
Version	1.5.1
APK size	28.2 MB
Number of libraries	?
Suitable for	Everyone
Ads	NO ads

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Dozenal Calc compared with similar apps

Common keywords of similar apps

Dozenal Base Twelve Digits Ten Calculators Unit Calc Repeating Exact Sin System Menu World Divisors Rational Parallel Bar Appears Period Root Inverses Constants Memory Round Angle Deg Default Switch Settings Time Converter Imperial Metric Units Theory Manuals Illustrated Show Calculator Number App Fraction Arithmetic Numbers Decimal Step Mathematics

Keywords missing from this app

Scientific Math Fractions Functions Calculations Operations Features Advanced Supports Calculation Addition Mixed Support Expression Students Solve School Recent Simple Convert Enter Expressions Complex Mathematical Subtraction Basic History Prime Includes Display Statistics Syntax High Multiplication Engineering Result Division Degrees Learn Precision Practice

Downloads over time

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Dozenal Calc has been downloaded 17 times. Over the past 30 days, it has been downloaded 6 times.

Changelog of Dozenal Calc

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Developer information for steinerschüler

steinerschüler

dozenal@weltanschauung.app

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Google Play Rankings for Dozenal Calc

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Technologies used by Dozenal Calc

2 permissions

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