Roman Numerals
Type a number (like 2026) or a Roman numeral (like MMXXVI) to convert it either way.
Convert
The symbols
| Symbol | Value |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1,000 |
The rules
- Symbols are written largest to smallest and added: VIII = 5 + 3 = 8.
- A smaller symbol before a larger one is subtracted, but only in six pairs: IV (4), IX (9), XL (40), XC (90), CD (400), CM (900).
- A symbol is repeated at most three times in a row: 30 is XXX, but 40 is XL.
- V, L and D are never repeated or subtracted.
The converter rejects non-standard forms such as IIII or IC so that each number has exactly one representation.
Worked example
Write 1994
- 1000 = M
- 900 = CM
- 90 = XC
- 4 = IV
MCMXCIV
Chart
| Number | Roman |
|---|---|
| 1 | I |
| 2 | II |
| 3 | III |
| 4 | IV |
| 5 | V |
| 6 | VI |
| 7 | VII |
| 8 | VIII |
| 9 | IX |
| 10 | X |
| 11 | XI |
| 12 | XII |
| 14 | XIV |
| 15 | XV |
| 19 | XIX |
| 20 | XX |
| 40 | XL |
| 49 | XLIX |
| 50 | L |
| 90 | XC |
| 99 | XCIX |
| 100 | C |
| 400 | CD |
| 500 | D |
| 900 | CM |
| 1000 | M |
| 1999 | MCMXCIX |
| 2024 | MMXXIV |
| 2025 | MMXXV |
| 2026 | MMXXVI |
| 3999 | MMMCMXCIX |