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Roman Numeral Converter

Convert numbers to Roman numerals and back instantly. Great for history, education, or formatting. No sign-up required. Keeps your data private on-device.

How to use this tool

  1. Enter a decimal number from 1 to 3999 to generate Roman notation.
  2. Enter a Roman numeral to decode it back into an integer value.
  3. Copy or download both conversion results for reuse or reference.

Useful contexts

  • Create classical numbering for outlines, events, and decorative labels.
  • Validate educational exercises and worksheet answers quickly.
  • Support historical, editorial, or ceremonial formatting conventions.

Notation rules

  • Standard modern Roman numeral rules are enforced up to 3999.
  • Input is normalized to uppercase for consistent parsing behavior.
  • Invalid sequences are rejected to help catch entry mistakes.

FAQ

Can I convert zero or negative numbers?
No. Classical Roman numerals do not represent zero or negative values.
Can I convert values above 3999?
Not in this implementation; extended overline notation is outside the current scope.
Why is a Roman input invalid?
Use valid subtractive forms (such as IV, IX, XL) and only the symbols I, V, X, L, C, D, M.

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