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Roman and Arabic Numeral Converter — Convert Numbers Online

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

Reference information

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-Arabic numeral converter allows you to convert numbers between Roman and Arabic numeral systems. It's useful for historians, students studying classical texts, and anyone working with ancient documents.

Roman numerals use letters to represent values: I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Numbers are written left to right from largest to smallest. If a smaller number precedes a larger one, it is subtracted (IV=4, IX=9).

The converter supports Arabic numbers from 1 to 3999 and their corresponding Roman numerals. The maximum Roman numeral is MMMCMXCIX (3999). There is no zero in the Roman system.

Yes, you can enter multiple numbers, each on a new line, and the tool will process them all at once. This is convenient for batch processing large lists of numbers.

Roman numerals are used for chapter numbering in books, denoting centuries, on clock faces, in film credits for release years, and in various official documents and inscriptions.
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Roman to Arabic Conversion

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Multiple Number Processing

Processes multiple numbers at once by entering them line by line. Saves time when working with large sets of numbers.