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Roman Numerals Converter - Convert Numbers to Roman Numerals

Convert numbers between decimal format and Roman numerals. Roman numerals were used in ancient Rome and can still be seen in modern times.

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Roman Numeral Symbols

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

Roman Numeral Rules

  • Repetition: Symbols I, X, C, and M can be repeated up to three times in succession (III = 3, XXX = 30).
  • Subtraction Rule: Only specific combinations use subtraction: IV (4), IX (9), XL (40), XC (90), CD (400), and CM (900).
  • Order: Numerals must be arranged in descending order of size, except where the subtraction rule applies.
  • Limitations: Traditional Roman numerals can only represent numbers from 1 to 3,999. Larger numbers require special notation.