Quick Answer
How do Roman numerals work?
// Answer
Roman numerals use seven letters: I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). Values are added left to right, except when a smaller value precedes a larger one, which means subtraction (IV = 4, IX = 9). This converter handles 1 to 3999.
Key values
| Number | Roman |
|---|---|
| 4 | IV |
| 9 | IX |
| 40 | XL |
| 90 | XC |
| 2026 | MMXXVI |
Why use this tool
For dates, names, and study
Roman numerals appear in clock faces, movie copyright dates, book chapters, monarch and pope names, and the Super Bowl. Convert them quickly in either direction.
FAQ
Frequently asked questions
Standard Roman numerals go up to 3999 (MMMCMXCIX). Larger numbers need special notation.
Subtractive notation: a smaller numeral before a larger one is subtracted, so IV = 5 - 1 = 4.
Yes, type the Roman numeral and the number updates.
Yes, it runs entirely in your browser.
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