Roman Numeral Converter
| Roman | Value |
|---|---|
| M | 1000 |
| CM | 900 |
| D | 500 |
| CD | 400 |
| C | 100 |
| XC | 90 |
| L | 50 |
| XL | 40 |
| X | 10 |
| IX | 9 |
| V | 5 |
| IV | 4 |
| I | 1 |
What are Roman Numerals?
Roman numerals are a numeral system originating in ancient Rome that uses combinations of letters from the Latin alphabet: I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). Subtractive notation is used for 4, 9, 40, 90, 400, and 900 — for example, IV means 4 and CM means 900. The standard system covers numbers from 1 to 3999. Roman numerals are still used today in clock faces, book chapter numbers, movie sequels, and year designations.
How to Use the Roman Numeral Converter
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In the Number → Roman tab, type any integer from 1 to 3999 — the Roman numeral appears instantly.
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Switch to Roman → Number to go the other way — type a Roman numeral like XIV and get 14.
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The converter validates your input and shows an error if the number is out of range or the Roman numeral is malformed.
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Click Example to load 2024 (MMXXIV) as a demonstration.
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Use Copy to copy the result to your clipboard.
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