Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals to numbers (1–3999), with strict validation.
- Free, no limits
- Runs in your browser
- No sign-up
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How to use the Roman Numeral Converter
- Enter a number between 1 and 3999.
- Or type a Roman numeral such as MMXXVI.
- Read the converted value instantly.
Frequently asked questions
Why only up to 3999?
Standard Roman numerals have no symbol above M (1000), so 3999 (MMMCMXCIX) is the largest regular value.
Is lowercase accepted?
Yes, input is case-insensitive.
Are invalid numerals detected?
Yes, forms like IIII or VX are rejected.
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