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Roman Numeral Converter

v1.1.1

Convert between Roman numerals and integers (I–MMMCMXCIX) bidirectionally.

Converts integers (1–3999) to Roman numerals and Roman numeral strings back to integers, with strict validation and a full numeral reference table.

How to use
  • →Type a number (1–3999) to convert it to Roman numerals, or type a Roman numeral to decode it.
  • →The tool validates correct subtractive notation (IV, IX, CM) and rejects invalid strings.
  • →Use the reference table to look up individual numeral values.

Supports 1–3999 (I to MMMCMXCIX)

Quick Reference