Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals back to numbers instantly
Enter a number (1–3999)
Result
Result will appear here
Examples
Frequently asked questions
What is the largest number a Roman numeral can represent?
Standard Roman numerals go up to 3999, written as MMMCMXCIX. Numbers larger than 3999 require extensions (like an overline) not covered by this tool.
Why is 4 written as IV and not IIII?
IV uses subtractive notation: a smaller numeral placed before a larger one means subtraction (V − I = 4). This keeps numerals compact and is the standard form used today.
What are Roman numerals used for today?
Roman numerals appear on clock faces, movie sequels and Super Bowl numbers, book chapters, architectural cornerstones, and year inscriptions on buildings and films.