Roman Numeral Converter
Convert between numbers and Roman numerals in both directions for 1 to 3999 locally.
This tool runs entirely in your browser. Your input is never uploaded.
Number to Roman numeral
Roman numeral to number
Roman Numeral Converter
Convert Arabic numbers (1 to 3999) to Roman numerals and back again. The tool handles standard modern notation including subtractive forms like IV, IX, XL, XC, CD, and CM.
Enter a number on the left or a Roman numeral on the right, and the result updates immediately. All logic runs locally in the browser.