Data lookups
Roman numerals
Convert a number to Roman numerals, or a numeral back to a number.
| Numeral | Value | Numeral | Value |
|---|---|---|---|
| I | 1 | II | 2 |
| III | 3 | IV | 4 |
| V | 5 | VI | 6 |
| VII | 7 | VIII | 8 |
| IX | 9 | X | 10 |
| XX | 20 | XXX | 30 |
| XL | 40 | L | 50 |
| LX | 60 | XC | 90 |
| C | 100 | CC | 200 |
| CD | 400 | D | 500 |
| CM | 900 | M | 1,000 |
| MM | 2,000 | MMM | 3,000 |
A smaller numeral before a larger one subtracts (IV = 4, IX = 9, CM = 900).
There is no zero, and nothing above 3,999 in standard notation.