Roman Numeral Converter
Convert between Arabic numbers and Roman numerals. Standard notation handles 1-3999; vinculum notation (overlines for ×1000) extends to 3,999,999. Live two-way binding.
How to use the Roman Numeral Converter
Type a number, see the Roman numeral. Type Roman numerals, see the number. Vinculum (overline = multiply by 1000) is used in output above 3999 — represented here with parentheses: (IV) means 4000.