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Roman Numeral Converter

Convert between Roman numerals and ordinary numbers

Digits go one way, letters the other — it works out which.

About Roman numerals

Roman numerals build a number from letters -- I, V, X, L, C, D, M -- added together, with a smaller letter before a larger one meaning subtraction, as in IV for four. The system has no zero and no place value, so it cannot express very large numbers cleanly.