Roman Numeral Converter
Convert numbers to Roman numerals and back (1–3999)
Common Roman Numerals
| Number | Roman | Number | Roman |
|---|---|---|---|
| 1 | I | 40 | XL |
| 2 | II | 50 | L |
| 3 | III | 90 | XC |
| 4 | IV | 100 | C |
| 5 | V | 400 | CD |
| 6 | VI | 500 | D |
| 7 | VII | 900 | CM |
| 8 | VIII | 1000 | M |
| 9 | IX | 1999 | MCMXCIX |
| 10 | X | 2000 | MM |
| 11 | XI | 2025 | MMXXV |
| 12 | XII | 2026 | MMXXVI |
About This Tool
Convert regular numbers to Roman numerals and Roman numerals back to numbers, with validation. Supports the standard range 1 to 3999 (I to MMMCMXCIX) used for clock faces, movie credits, outlines, and dates.
Frequently Asked Questions
Why only up to 3999?
Standard Roman numerals have no symbol beyond M (1000), and four repeats (MMMM) are not conventional. Larger numbers historically used an overline, which plain text cannot represent.
What is 2026 in Roman numerals?
2026 = MMXXVI (MM = 2000, XX = 20, VI = 6).
What does subtractive notation mean?
A smaller symbol before a larger one subtracts: IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900.
Is lowercase input accepted?
Yes. Input like "mmxxvi" is treated the same as "MMXXVI".