Online converter of Roman numerals to Arabic and vice versa

Convert Roman numerals to Arabic and vice versa. Process multiple numbers line by line with instant results and a detailed reference.

Roman numerals:

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

Writing rules:

  • • Numbers are written left to right from largest to smallest
  • • If a smaller number is before a larger one, it is subtracted (IV = 4, IX = 9)
  • • If a smaller number is after a larger one, it is added (VI = 6, XI = 11)
  • • Maximum number: 3999 (MMMCMXCIX)

Examples:

1 = I
4 = IV
5 = V
9 = IX
10 = X
50 = L
100 = C
500 = D
1000 = M

Roman to Arabic Numeral Converter - Convert Numbers Online

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Convert Roman numerals to Arabic and vice versa with our online converter. Process multiple numbers line by line with instant results and a detailed reference guide.

The tool supports both conversion from Roman to Arabic numerals and from Arabic to Roman, making it useful for historians, students, and anyone working with classical numeral systems.

Perfect for educational purposes, historical research, and understanding classical number representations with built-in reference information.

Frequently Asked Questions (FAQ)

The Roman and Arabic numeral converter allows you to convert numbers between the Roman and Arabic numeral systems. This is useful for historians, students studying classical texts, and anyone working with ancient documents.

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