How to Use the Roman Numeral Converter
- To Roman: Enter a standard number (e.g., 2024) in the "Number" field. The tool will instantly generate the Roman Numeral equivalent (MMXXIV).
- To Number: Enter Roman numerals (e.g., XIV) in the "Roman Numeral" field to see the standard integer value (14).
- Validation: The tool automatically checks for valid characters. It only accepts I, V, X, L, C, D, and M.
Mastering Roman Numerals
Roman numerals originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages. They are still used today in clock faces, super bowls, copyrights, and monarch names (e.g., King Charles III).
The 7 Basic Symbols
| Symbol | Value | Mnemonic |
|---|---|---|
| I | 1 | Index finger |
| V | 5 | Hand (V-shape) |
| X | 10 | Two hands |
| L | 50 | Legacy |
| C | 100 | Centum (Century) |
| D | 500 | Demi (Half of M) |
| M | 1,000 | Mille (Millennium) |
The Rules
- Addition: When a symbol appears after a larger (or equal) symbol, it is added.
VI = 5 + 1 = 6 - Subtraction: When a symbol appears before a larger symbol, it is subtracted.
IV = 5 - 1 = 4 - Repetition: A symbol cannot be repeated more than three times.
40 is XL, not XXXX