The Roman Numeral Converter translates between modern Arabic numbers (1, 2, 3…) and Roman numerals (I, II, III…) in both directions. Type a number to see its Roman form, or type a Roman numeral to read its decimal value.

It follows standard Roman numeral rules, including subtractive notation (IV = 4, IX = 9, XL = 40) and the conventional range up to 3999, where each numeral uses the symbols I, V, X, L, C, D, and M.