Roman Numeral Converter
Convert between Arabic numbers and Roman numerals. Works for values 1–3,999.
Roman Numeral
Roman numeral reference
| Symbol | Value | Symbol | Value |
|---|---|---|---|
| I | 1 | L | 50 |
| IV | 4 | XC | 90 |
| V | 5 | C | 100 |
| IX | 9 | CD | 400 |
| X | 10 | D | 500 |
| XL | 40 | CM | 900 |
| — | — | M | 1,000 |
Frequently asked questions
Why does Roman numerals stop at 3,999?
Standard Roman numeral notation only goes to 3,999 (MMMCMXCIX). Numbers above this require a bar over a numeral to indicate multiplication by 1,000, which is not supported in standard text.
What does the subtractive principle mean?
When a smaller numeral appears before a larger one, it is subtracted. For example, IV = 5−1 = 4, and XL = 50−10 = 40.
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