About Roman Numerals Converter
The Roman Numerals Converter converts integers (1–3999) to Roman numerals or decodes Roman numeral strings back to integers. Supports standard subtractive notation (IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900).
Roman numerals are still used today for clock faces, book chapters, movie sequels, copyright years, Super Bowl numbers, and formal documents. This tool handles all standard Roman numeral values instantly.
The converter works in both directions: enter a number to get the Roman numeral, or enter Roman numerals to get the decimal value.
How to Use Roman Numerals Converter
Enter a number (1–3999) to convert to Roman numerals.
Or enter Roman numerals (e.g. MMXXIV) to convert to a number.
The result is shown instantly.
Copy the result.
Examples
Frequently Asked Questions
What is the largest number supported?
3999 (MMMCMXCIX) — standard Roman numerals do not have a symbol for 4000 or higher without using the vinculum (bar over a numeral) notation.
What is subtractive notation?
Subtractive notation places a smaller numeral before a larger one to indicate subtraction: IV = 5-1 = 4, IX = 10-1 = 9, XL = 50-10 = 40, CD = 500-100 = 400, CM = 1000-100 = 900.
Can I convert the current year to Roman numerals?
Yes — enter the year (e.g. 2024) and get the Roman numeral (MMXXIV).
Why do clock faces use IIII instead of IV?
This is a traditional convention in clockmaking, possibly for visual balance with VIII on the opposite side, or because IIII was used in ancient times before subtractive notation was standardized.
What does MMXXIV mean?
MM = 2000, XX = 20, IV = 4. MMXXIV = 2024.