Roman Numeral Converter
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Common years
Roman Numeral Symbols
Subtractive Notation Rules
Roman numerals use subtractive notation for six specific combinations — placing a smaller numeral before a larger one means subtract, not add:
Examples
X(10) + IV(4)
XL(40) + II(2)
M(1000) + CM(900) + XC(90) + IX(9)
MM(2000) + XX(20) + IV(4)
MMM(3000) + CM(900) + XC(90) + IX(9)
Frequently Asked Questions
Why does the converter stop at 3,999?
Standard Roman numerals can only represent numbers up to 3,999 (MMMCMXCIX) because M is the largest symbol and you can only repeat a symbol three times consecutively. Numbers above 3,999 require special notation (a bar over a numeral to multiply by 1,000) not commonly used today.
Where are Roman numerals still used?
Roman numerals appear on clock faces, movie sequels and Super Bowl titles, copyright dates on films and TV shows, outlines and chapter numbers in books, tattoos of meaningful years, and in academic and legal contexts for ordering.
How do I read a Roman numeral with subtraction, like IV or CM?
When a smaller numeral appears immediately before a larger one, you subtract rather than add. IV means 5 minus 1 = 4. CM means 1,000 minus 100 = 900. Only six subtractive combinations are standard: IV (4), IX (9), XL (40), XC (90), CD (400), and CM (900). Any other arrangement uses only addition.
Can Roman numerals represent zero or negative numbers?
No. The Roman numeral system has no symbol for zero and cannot represent negative numbers. This was one of its major limitations for advanced mathematics and commerce, which contributed to the eventual adoption of the Hindu-Arabic numeral system (0–9) that we use today. Zero as a number was independently developed in India and later transmitted to Europe.