Roman Numeral Converter

Convert Roman numerals ↔ decimals

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About Roman Numeral Converter

A bidirectional Roman numeral converter that instantly translates between Roman numerals (I, V, X, L, C, D, M) and Arabic/decimal numbers. Handles the standard range (1-3999) and extended notation with vinculum (overlines) for values up to 3,999,999. Shows step-by-step conversion breakdowns explaining the subtractive notation rules (IV = 4, IX = 9, etc.). Includes input validation and educational reference charts. Perfect for students, historians, clock face designers, and Super Bowl fans.

Roman Numeral Converter Features

  • Bidirectional conversion
  • Step-by-step breakdown
  • Values up to 3,999
  • Validation & error handling
  • Reference chart

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