Free Online Roman Numeral Converter
Convert any whole number from 1 to 3999 into its Roman numeral equivalent, or convert a Roman numeral string back to an Arabic number. Invalid numerals are detected and rejected.
Arabic Number (1 – 3999)
Roman Numeral
Roman Numeral Symbol Reference
| Symbol | Value |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |
Subtractive notation: placing a smaller symbol before a larger one means subtraction — IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900.