What this site does
- Converts numbers from 1 to 999999 into Roman numerals.
- Converts Roman numerals back into numbers.
- Rejects non-canonical input to keep results consistent.
- Runs fully in the browser with JavaScript.
About Roman Numeral Converter
roman-numeral.org is a static browser tool built for fast, readable conversion between Arabic numbers and Roman numerals.
Notation details
The converter uses standard subtractive notation for values up to 3999. For larger values, combining overline notation is used where each overlined symbol has a value multiplied by 1000.
- I̅V̅ = 4000
- V̅ = 5000
- C̅M̅X̅C̅I̅X̅CMXCIX = 999999
Scope
This site is intended for educational, editorial, and day-to-day utility use. It keeps no user accounts and does not require registration.