---
title: "1,001 in Roman numerals is MI"
description: "1,001 in Roman numerals is MI, written as 1000 + 1. How it breaks down, how to write it, and the numbers either side."
url: https://atoneplace.net/roman-numerals/1001/
site: "At One Place"
---

# 1,001 in Roman numerals

**1,001 in Roman numerals: MI**

1,001 is written MI in Roman numerals. That is 2 symbol groups added together, reading left to right from the largest value down.

## How it breaks down

*MI = 1000 + 1 = 1,001*

| Group | Value | Subtraction | Running total |
| --- | --- | --- | --- |
| M | 1,000 | — | 1,000 |
| I | 1 | — | 1,001 |

## No subtraction needed

MI is purely additive — every symbol is simply added to the one before it, with no subtractive pairs like IV or IX. Numbers avoid subtraction when none of their digits is a 4 or a 9.

## The symbols

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

## The same number, other ways

- **In words:** One thousand one
- **Roman numeral:** MI
- **Symbol count:** 2 characters
- **Binary:** 1111101001
- **Hexadecimal:** 3E9

## The numbers either side

| Number | Roman numeral |
| --- | --- |
| 999 | CMXCIX |
| 1,000 | M |
| 1,001 | MI ← |
| 1,002 | MII |
| 1,003 | MIII |

## Common questions

### What is 1001 in Roman numerals?

1,001 is MI.

### What does MI mean?

MI is the Roman numeral for 1,001 — 1000 + 1.

### How do you write 1001 in Roman numerals?

Take the largest value that fits and repeat until nothing is left: M (1000), then I (1). That gives MI.

## Related pages

- [999 in Roman numerals](https://atoneplace.net/roman-numerals/999/)
- [1,000 in Roman numerals](https://atoneplace.net/roman-numerals/1000/)
- [1,002 in Roman numerals](https://atoneplace.net/roman-numerals/1002/)
- [1,003 in Roman numerals](https://atoneplace.net/roman-numerals/1003/)
- [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/)