Roman Numeral Converter

Convert numbers to Roman numerals and back — with rules explanation

Roman Numeral

MMXXIV

Roman Numeral Rules

  • • I=1, V=5, X=10, L=50, C=100, D=500, M=1000
  • • A smaller numeral before a larger = subtraction (IV=4, IX=9, XL=40, XC=90, CD=400, CM=900)
  • • Max 3 of same numeral in a row (III=3, but IIII is invalid)
  • • Valid range: 1–3999 (MMMCMXCIX)

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