19 = XIX
Split 19 into 10 + 9 and write each part: X (10) + IX (9) = XIX.
XIX uses subtraction: IX = 9. A smaller symbol before a larger one is subtracted.
| Symbol | I | V | X | L | C | D | M |
|---|---|---|---|---|---|---|---|
| Value | 1 | 5 | 10 | 50 | 100 | 500 | 1,000 |
Need another number? Use the Roman numeral converter (both directions).
| Number | Roman numeral |
|---|---|
| 15 | XV |
| 16 | XVI |
| 17 | XVII |
| 18 | XVIII |
| 20 | XX |
| 21 | XXI |
| 22 | XXII |
| 23 | XXIII |