---
title: "9 in Roman numerals is IX"
description: "9 in Roman numerals is IX, written as 9. How it breaks down, how to write it, and the numbers either side."
url: https://atoneplace.net/roman-numerals/9/
site: "At One Place"
---

# 9 in Roman numerals

**9 in Roman numerals: IX**

9 is written IX in Roman numerals. That is 1 symbol group added together, reading left to right from the largest value down.

## How it breaks down

*IX = 9 = 9*

| Group | Value | Subtraction | Running total |
| --- | --- | --- | --- |
| IX | 9 | X − I | 9 |

## Why the smaller symbol comes first

IX uses subtractive notation in one place: IX means X minus I, or 9. A smaller symbol placed before a larger one is subtracted from it rather than added, which is why IX is nine and not eleven.

Only six such pairs are valid — IV, IX, XL, XC, CD and CM. That restriction is what makes the notation unambiguous: IIII and IC both look like they should work, but neither is standard, and only one spelling of any number is correct.

## The symbols

| Symbol | Value | Used here |
| --- | --- | --- |
| I | 1 | yes — 1× |
| V | 5 | no |
| X | 10 | yes — 1× |
| L | 50 | no |
| C | 100 | no |
| D | 500 | no |
| M | 1,000 | no |

## The same number, other ways

- **In words:** Nine
- **Roman numeral:** IX
- **Symbol count:** 2 characters
- **Binary:** 1001
- **Hexadecimal:** 9

## The numbers either side

| Number | Roman numeral |
| --- | --- |
| 7 | VII |
| 8 | VIII |
| 9 | IX ← |
| 10 | X |
| 11 | XI |

## Common questions

### What is 9 in Roman numerals?

9 is IX.

### What does IX mean?

IX is the Roman numeral for 9 — 9.

### How do you write 9 in Roman numerals?

Take the largest value that fits and repeat until nothing is left: IX (9). That gives IX.

## Related pages

- [7 in Roman numerals](https://atoneplace.net/roman-numerals/7/)
- [8 in Roman numerals](https://atoneplace.net/roman-numerals/8/)
- [10 in Roman numerals](https://atoneplace.net/roman-numerals/10/)
- [11 in Roman numerals](https://atoneplace.net/roman-numerals/11/)
- [4 in Roman numerals](https://atoneplace.net/roman-numerals/4/)
- [14 in Roman numerals](https://atoneplace.net/roman-numerals/14/)
- [19 in Roman numerals](https://atoneplace.net/roman-numerals/19/)
- [40 in Roman numerals](https://atoneplace.net/roman-numerals/40/)
- [42 in Roman numerals](https://atoneplace.net/roman-numerals/42/)
- [49 in Roman numerals](https://atoneplace.net/roman-numerals/49/)
- [50 in Roman numerals](https://atoneplace.net/roman-numerals/50/)
- [64 in Roman numerals](https://atoneplace.net/roman-numerals/64/)

## Sources

- Calculated on this page — At One Place (/about/)