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About Roman Numerals

Roman numerals use combinations of I V X L C D M (1, 5, 10, 50, 100, 500, 1000). Smaller values before a larger one subtract — IV = 4, IX = 9.

Standard notation covers 1–3999. Conversion happens entirely in your browser.

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Roman Numeral Converter

Convert Roman numerals to numbers and numbers to Roman numerals, live.

Arabic to roman

XLII

Roman to arabic

42

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