Roman Numeral Calculate Click here for the opposite calculation MCMXCIX = 1999 Roman Numeral Symbols SymbolNumber I 1 V 5 X 10 L 50 C 100 D 500 M 1,000 V 5,000 X 10,000 L 50,000 C 100,000 D 500,000 M 1,000,000 Learn more about Roman Numerals...