Roman Numeral Converter
Turn a whole number into a Roman numeral, or read a Roman numeral back as a number. It works both ways, checks your entry, and shows how the answer is built.
Type a value, then press Convert (or just press Enter).
How Roman numerals work
| Symbol | Value |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |
Symbols are added from largest to smallest, so MMXXVI is 1000 + 1000 + 10 + 10 + 5 + 1 = 2026. When a smaller symbol sits in front of a larger one, you subtract it. The six subtractive pairs are IV (4), IX (9), XL (40), XC (90), CD (400) and CM (900). Roman numerals have no zero, so this tool covers 1 through 3999.