Roman Numeral Converter

The Roman Numeral Converter translates between standard decimal numbers and Roman numerals in both directions. Enter a number (1–3999) to get its Roman numeral representation, or enter a Roman numeral to get the decimal value.

Roman numerals are still used today in clock faces, book chapters, movie sequels, outlines, and formal documents. Understanding them is part of general numeracy and cultural literacy.

The converter validates input, explains the breakdown of each Roman numeral symbol, and handles both uppercase and lowercase input. It follows the standard subtractive notation rules (e.g., IV = 4, IX = 9).