Quick guide
Converting roman numerals to arabic numbers using our converters is easy!
This quick guide will show you how to use the converter and how to learn about roman numerals at the same time.
Entering numerals
Simply enter numerals into the form and we'll do the rest! Any invalid characters will be automatically removed.
You don't need to worry about holding down shift or caps lock, anything you enter will be automatically converted to uppercase.
The numeral conversion supports bracket notation to assist with numbers over 3999.
Visual feedback
Our numeral converter is not only about converting a numeral to a number. Unlike the rest of the converters on the internet, our converter doesn't simply shout "INVALID!!!" if you enter an invalid numeral; we like to show you where you went wrong and provide the correct solution for you.
Chunk notation
Our 'chunk' notation provides instant feedback to the numeral you've entered. It's great for visualising the additions taking place and it's a handy guide for viewing any subtractive numerals. You can read more about our chunk notation. This is the year 1999 (or MCMXCIX) in chunk notation:
Correct numerals
If you enter a perfectly valid numeral a message will appear with a green bar
Incorrect solution
If you enter an invalid numeral, the correct numeral solution will appear with an orange bar
Errors
If you write an invalid numeral, the errors will be listed with a red bar
Caveats
If a solution has any caveats, they are shown with a blue bar
