Roman Numeral Converter
Convert numbers to Roman numerals and back.
Enter a number (1–3999) or a Roman numeral.
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How to use this calculator
Type a number to get its Roman numeral, or type a Roman numeral to get the number.
Formula / method used
Roman numerals use M=1000, D=500, C=100, L=50, X=10, V=5, I=1 with subtractive notation.