9 = IX
9 in Roman numerals is IX.
Nine written with the letters I X.
9 in words: Nine
Nine in Roman numerals is IX. It is short enough to write from memory once you know the pattern, and it turns up constantly on watch dials, book chapters and film sequels.
Notice the subtractive pair in IX: a smaller symbol sits before a larger one to save writing four identical letters in a row. This is the single rule that trips most people up, and once it clicks the rest of the system is straightforward.
How 9 breaks down
Reading IX from left to right, each group is added together to reach 9:
| Group | Value | Place |
|---|---|---|
| IX | 9 | ones |
| IX | 9 | total |
Frequently asked questions
What is 9 in Roman numerals?
9 in Roman numerals is IX.
How do you write 9 in words?
9 is written "Nine" in English.
What number comes before IX?
The number before IX is 8, written VIII in Roman numerals.
What number comes after IX?
The number after IX is 10, written X in Roman numerals.
Related numbers
Last updated July 22, 2026. Reviewed for accuracy against the standard rules for Roman numerals.