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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 from left to right, from largest to smallest
  • • If a smaller number precedes a larger one, it is subtracted (IV = 4, IX = 9)
  • • If a smaller number follows 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
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Features of the "Roman to Arabic Converter"

Roman to Arabic Conversion

Instantly converts Roman numerals to their Arabic representation. Useful for understanding classical numeral systems and historical documents.

Arabic to Roman Conversion

Converts Arabic numbers to Roman numerals. Essential for educational purposes and working with classical texts.

Multiple Number Processing

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

Useful Instruments

Online converter of Roman numerals to Arabic and vice versa

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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.

Roman numerals use letters to represent values: I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Numbers are written from 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 numerals 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 of large lists of numbers.

Roman numerals are used for numbering chapters in books, denoting centuries, on clock faces, and in various official documents and inscriptions.

The concept of zero as a number and placeholder was developed much later than the creation of the Roman numeral system, which was primarily additive and subtractive, not positional like the Arabic system.

Yes, while there are historical variations, the most common form today is 'modern Roman notation,' which follows specific rules for subtractions (e.g., IV for 4, IX for 9) and for avoiding repeating a symbol more than three times.

The traditional Roman system does not have a standard way to represent numbers greater than 3999.
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