Convert numbers to Roman numerals and back
Type a number to see it written in Roman numerals, or switch direction and type Roman numerals to get the number back. Valid for the standard range of 1 to 3999 - the practical limit of the notation since there's no Roman symbol for zero or for numbers of that size.
How to use it
- Choose Number → Roman or Roman → Number.
- Type your value.
- Read the converted result instantly.
Roman numeral values
| Symbol | Value |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |
Numerals are combined by addition (VI = 6) and subtraction when a smaller symbol precedes a larger one (IV = 4, IX = 9, XC = 90, CM = 900). This tool follows those standard subtractive-notation rules exactly, so results match what you'd see on clock faces, movie copyright years and book chapter numbers.
Common uses
- Reading years on movie credits or building cornerstones
- Numbering book chapters, outlines or Super Bowl editions
- Homework and quizzes on Roman numeral notation
- Checking a watch or clock face that uses Roman numerals
Frequently asked questions
What is the highest Roman numeral this supports?
3999 (MMMCMXCIX), which is the practical limit of standard Roman numeral notation.
Is it free?
Yes, free with no signup and unlimited use.
Does it validate Roman numerals?
Yes. If you type an invalid combination of letters, it tells you it isn't a valid Roman numeral.
Is there a zero in Roman numerals?
No, the Roman numeral system has no symbol for zero, so this converter only accepts numbers from 1 to 3999.