---
title: "159 in Roman numerals is CLIX"
description: "159 in Roman numerals is CLIX, written as 100 + 50 + 9. How it breaks down, how to write it, and the numbers either side."
url: https://atoneplace.net/roman-numerals/159/
site: "At One Place"
---

# 159 in Roman numerals

**159 in Roman numerals: CLIX**

159 is written CLIX in Roman numerals. That is 3 symbol groups added together, reading left to right from the largest value down.

## How it breaks down

*CLIX = 100 + 50 + 9 = 159*

| Group | Value | Subtraction | Running total |
| --- | --- | --- | --- |
| C | 100 | — | 100 |
| L | 50 | — | 150 |
| IX | 9 | X − I | 159 |

## Why the smaller symbol comes first

CLIX 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 | yes — 1× |
| C | 100 | yes — 1× |
| D | 500 | no |
| M | 1,000 | no |

## The same number, other ways

- **In words:** One hundred fifty-nine
- **Roman numeral:** CLIX
- **Symbol count:** 4 characters
- **Binary:** 10011111
- **Hexadecimal:** 9F

## The numbers either side

| Number | Roman numeral |
| --- | --- |
| 157 | CLVII |
| 158 | CLVIII |
| 159 | CLIX ← |
| 160 | CLX |
| 161 | CLXI |

## Common questions

### What is 159 in Roman numerals?

159 is CLIX.

### What does CLIX mean?

CLIX is the Roman numeral for 159 — 100 + 50 + 9.

### How do you write 159 in Roman numerals?

Take the largest value that fits and repeat until nothing is left: C (100), then L (50), then IX (9). That gives CLIX.

## Related pages

- [157 in Roman numerals](https://atoneplace.net/roman-numerals/157/)
- [158 in Roman numerals](https://atoneplace.net/roman-numerals/158/)
- [160 in Roman numerals](https://atoneplace.net/roman-numerals/160/)
- [161 in Roman numerals](https://atoneplace.net/roman-numerals/161/)
- [4 in Roman numerals](https://atoneplace.net/roman-numerals/4/)
- [9 in Roman numerals](https://atoneplace.net/roman-numerals/9/)
- [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/)

## Sources

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