When you see "MMXXVI" carved into stone, printed on a copyright notice, or tattooed on someone's arm, you're looking at a number system that has survived over 2,500 years. Roman numerals remain everywhere: movie credits, book chapters, clock faces, building cornerstone dates, and even Super Bowl titles. Yet for most people, reading anything beyond "I, II, III" requires mental gymnastics or a quick internet search. A Roman numeral converter solves this ancient puzzle instantly. It translates between our familiar Arabic numbers (1, 2, 3...) and the Roman system (I, II, III...), making it easy to decode historical dates, create meaningful tattoos, or understand why your birth year might be written as MCMXC instead of 1990. This comprehensive guide explains exactly how Roman numerals work, why they have strict limits, how conversion works in both directions, and the common mistakes that lead people to write invalid Roman numbers. What Is a Roman Numeral Converte...