Roman Numeral Converter
Type a number or a Roman numeral — it converts both ways as you type.
Runs in your browser — nothing is uploadedHow to use Roman Numeral Converter
- Type a number (1–3999) in the left box, or a Roman numeral in the right box.
- The other box updates instantly.
Questions
Why only up to 3,999?
Standard Roman numerals have no symbol above M (1000) and use at most three repeats, so 3,999 (MMMCMXCIX) is the largest regular value.