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

# 1 in Roman numerals

**1 in Roman numerals: I**

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

## How it breaks down

*I = 1 = 1*

| Group | Value | Subtraction | Running total |
| --- | --- | --- | --- |
| I | 1 | — | 1 |

## No subtraction needed

I 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 | no |

## The same number, other ways

- **In words:** One
- **Roman numeral:** I
- **Symbol count:** 1 characters
- **Binary:** 1
- **Hexadecimal:** 1

## The numbers either side

| Number | Roman numeral |
| --- | --- |
| 1 | I ← |
| 2 | II |
| 3 | III |

## Common questions

### What is 1 in Roman numerals?

1 is I.

### What does I mean?

I is the Roman numeral for 1 — 1.

### How do you write 1 in Roman numerals?

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

## Related pages

- [2 in Roman numerals](https://atoneplace.net/roman-numerals/2/)
- [3 in Roman numerals](https://atoneplace.net/roman-numerals/3/)
- [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/)
- [64 in Roman numerals](https://atoneplace.net/roman-numerals/64/)
- [90 in Roman numerals](https://atoneplace.net/roman-numerals/90/)

## Sources

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