# Roman Numerals

Convert between Roman numerals and decimal numbers.

## URL

https://ilham.dev/tools/roman-numeral/

## What It Does

Convert between Roman numerals and decimal numbers, using the subtractive notation for 4, 9, 40, 90, 400 and 900. It covers 1 to 3999, which is the range the plain notation reaches without an overline.

## Features

- Runs in the browser
- No login required

## Input

text input.

## Output

text output.

## Privacy

Processing happens locally in the browser.

No input data is uploaded to ilham.dev.

- Requires login: false
- Requires API key: false
- Stores user data: false


## Examples

- Why does it stop at 3999?




## Questions

### Why does it stop at 3999?

Standard Roman notation has no zero and no way to write larger numbers without an overline or a different convention. 3999 is MMMCMXCIX, the largest value the plain form expresses.