Roman Numerals Converter

785 reviews
Content rating
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About this app

Two-way conversion between Roman numerals and Arabic (decimal) numbers
Converts Roman numerals from 1 - 3,999,999
Supports 5 operations (^ * / + -), parenthesis, and decimal points
Follows the correct order of operations
Interprets expressions consisting of Roman numerals, Arabic (decimal) numbers, and a combination of the two
Able to reformat improper Roman numerals and simplify expressions
Displays output as you type
Copy/paste functionality
Custom keyboard
English, Spanish, and Russian
0.15 MB download
No permissions
No ads
Updated on
Jan 28, 2015

Data safety

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No data collected
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785 reviews
William Wilkerson
January 22, 2023
GREAT APP! Does exactly what I was looking & hoping for...! BUT that's not all — also has a built-in CALCULATOR (including basic @mathematics features characters (ex: parenthesis and exponents) — and the mathematics allows for mixed statements (ex: Roman Numerals & Standard Base-10 in the same statement, like so: IX * 3 = 27; where IX is equivalent to 9 in Base-10 numbers)... FINALLY, there is a "SIMPLIFY" button that fixes any statements, ex: ORIG: "DXD" should be written as "CMXC" [=990]...
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A Google user
August 21, 2019
This is a great app for figuring out a specific Roman numeral converting either from Roman numeral to a number or vice versa. I use this because I want to name all my planets in no man's sky using Roman numerals, but i was a bit rusty on how anything above 399 worked. This will not disappoint though for whatever specific purpose you may have for this app.
36 people found this review helpful
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Joel Christophel
August 21, 2019
Hahaha, that's the most niche use case I've heard about. Cheers, dude!
A Google user
May 24, 2019
I feel like this app is very convenient for me along with providing quick and accurate results!! It's also taught me how to convert some roman numerals in my head.
14 people found this review helpful
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What's new

v1.1.2 Available to devices running Android 2.0 (API level 5), copy/paste functionality available to all, translated into Russian
v1.1.1 Fixed bugs, reduced file size
v1.1 Added copy/paste functionality for users with Android 3.0 (API level 11) and up, upgraded to a more conventional counting system
v1.0.3 Overline button turns off automatically
v1.0.2 Available to devices running Android 2.3 (API level 9) and up, reduced file size by 40%