Roman Numeral Converter

Convert between numbers and Roman numerals

Number to Roman Numeral

Roman Numeral:

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Roman Numeral to Number

Number:

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Roman Numeral Reference

I 1
V 5
X 10
L 50
C 100
D 500
M 1000

Rules:

  • Repeated symbols are added (II = 2, XX = 20)
  • Smaller before larger means subtraction (IV = 4, IX = 9)
  • Only I, X, and C can be used as subtractive prefixes
  • No symbol repeats more than 3 times in succession

Common Examples

4 → IV
9 → IX
40 → XL
90 → XC
400 → CD
900 → CM
1994 → MCMXCIV
2024 → MMXXIV