Roman Numeral Converter — Arabic to Roman and Vice Versa
Convert any number instantly: Roman to Arabic or Arabic to Roman
Roman numerals are still widely used in modern life: watch faces, movie and TV series titles, book chapters, Super Bowl editions, Olympic Games, monarch and pope names, building inscriptions, and tattoos.
Our converter works in both directions — type any Arabic number (1 to 3999) to get the Roman numeral equivalent, or enter a Roman numeral to convert it back to decimal. All subtractive rules are handled automatically.
Quick reference: I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Key combinations: IV=4, IX=9, XL=40, XC=90, CD=400, CM=900. Example: 2025 in Roman numerals = MMXXV.
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