Roman Numeral Converter

Convert between Roman and Arabic numerals
This free online roman numeral converter runs in your browser and is part of our Converters collection.

🏛️ Roman Numeral Converter

Convert between Roman numerals and Arabic numbers

Roman Numeral Rules:

  • Basic Symbols: I=1, V=5, X=10, L=50, C=100, D=500, M=1000
  • Addition: When a smaller value follows a larger, add them (VI = 6)
  • Subtraction: When a smaller value precedes a larger, subtract (IV = 4, IX = 9)
  • Repetition: Symbols can repeat up to 3 times (III = 3, XXX = 30)
  • Range: Standard Roman numerals cover 1-3999

Common Roman Numerals:

I = 1
V = 5
X = 10
L = 50
C = 100
D = 500
M = 1000
IV = 4
IX = 9
XL = 40
XC = 90
CD = 400
CM = 900

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