Convert Large Numbers to Roman Numerals
Converts Base 10 cardinal numbers (1 to 4,999,999,999) to Roman Numerals
Roman Numeral Converter
Enter any cardinal greater than 0 (1,2,3...) through to 4,999,999,999 and this free online tool will convert it to Roman Numeral format.
Most online Roman Numeral converters only go to 4999; ours will convert to Roman Numerals provided you enter a number less than 5 thousand million (5,000,000,000 AKA 0.5 billion)
Your Roman Numeral is: