Convert Roman numerals to numbers and numbers to Roman numerals online, in your browser.
Convert in either direction automatically: type a Roman numeral to get the integer, or an integer (1–3999) to get the Roman numeral.
Standard Roman numerals cover 1 to 3999 (MMMCMXCIX). There is no zero or negative in the classical system.
Yes — if the input is only Roman letters it converts to a number; otherwise it treats it as an integer to convert to Roman.