⇄ Converters
Math
Roman Numeral Converter
Convert standard Roman numerals and whole numbers from 1 to 3,999.
Standard subtractive notation
The converter supports the common modern Roman numeral system for values from 1 to 3,999, including forms such as IV, IX, XL, XC, CD, and CM.
How this resource works
Number-to-Roman conversion repeatedly subtracts the largest valid symbol value. Roman-to-number conversion subtracts a symbol when a larger-valued symbol follows it, then validates the result by converting it back to canonical notation.