Roman Numeral Converter
Convert between numbers and Roman numerals in either direction — type 1994 or MCMXCIV and the tool detects which way to go.
Processed locally in your browser — nothing is uploaded.
The direction is detected automatically. Valid range: 1–3999.
Enter a number like 1994 or a numeral like MCMXCIV.
About Roman Numeral Converter
One input, both directions: digits convert to a Roman numeral, letters convert back to a number. Standard subtractive notation is enforced, so IIII or VX are rejected with a clear message instead of a wrong answer. The supported range is 1 to 3999, the limit of classic notation.
Common uses
- Decode the year in a film's credits or on a building
- Write a date or chapter number in Roman numerals
- Check homework answers in both directions
Example
Input
1994
Output
MCMXCIV
Limitations
- Numbers above 3999 need overline notation, which plain text can't represent