How do Roman numerals work?

I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Subtractive: IV=4, IX=9, XL=40, XC=90, CD=400, CM=900.

Math

Roman Numerals

Convert between Arabic numbers and Roman numerals. Supports values up to 3999.

Number (1-3999)

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