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Roman Numeral Converter
Convert integers and canonical subtractive Roman numerals in the range 1–3999.
Admitted integer or rational text fields
roman-numeral.json
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the admitted values using the labeled input fields.
- Choose the explicit operation and options, then inspect the stated conventions and limits.
- Select Convert Roman numeral and download roman-numeral.json.
Examples
2026 converts to MMXXVI; 944 converts to CMXLIV.
Limitations
- Integers 1–3,999; uppercase Roman tokens up to 15 characters and 32 raw field characters; 64 KiB report. Noncanonical, additive, overline, zero and extended-range forms refuse.
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