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About the Roman Numeral Converter
The Roman Numeral Converter turns numbers into Roman numerals and Roman numerals back into Arabic numbers. Enter either a number such as 1987 or a numeral such as MCMLXXXVII, and the tool returns the converted value with validation and clean formatting.
The converter follows the standard Roman numeral rules, including subtractive notation, where a smaller symbol before a larger one means subtraction, as in IV for 4 and CM for 900. It accepts whole numbers from 1 to 3999 and the letters I, V, X, L, C, D, and M. Invalid input triggers a clear error message. A practical tip: type numerals in uppercase, since lowercase letters may not be recognized.
- Type an Arabic number or a Roman numeral into the input field.
- Press the convert button to run the conversion.
- Read the result, then copy it or enter a new value.