Roman Numeral | How to use and interpret results
Convert integers from 1 to 3999 into conventional Roman numerals and back. Subtractive forms such as IV and IX are checked by regenerating a canonical representation.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
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How to use this tool
Choose the direction and enter an integer or Roman letters. Numeric input rejects fractions and trailing text; Roman letters are normalized to uppercase for checking.
Results and examples
2024 becomes MMXXIV and XIV becomes 14. A form such as IIII may appear on clocks but does not match this tool's canonical subtractive output.
Worked example
2024 becomes MMXXIV and XIV becomes 14. A form such as IIII may appear on clocks but does not match this tool's canonical subtractive output.
Limitations
- Zero, negative values, 4000 and above, and overbar notation are unsupported.
- Historical nonstandard variants are not all accepted.
Fields
| Field | Guidance and constraints |
|---|---|
| Direction | Check the unit and format displayed beside this field. |
| Input | Check the unit and format displayed beside this field. |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
How is 2024 written in Roman numerals?
2024 becomes MMXXIV and XIV becomes 14. A form such as IIII may appear on clocks but does not match this tool's canonical subtractive output.
Can a clock's IIII be rejected?
Zero, negative values, 4000 and above, and overbar notation are unsupported. Historical nonstandard variants are not all accepted.
