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Convert to Roman Numerals

Converts an integer into its equivalent Roman numeral representation.

convertToRomanNumerals​

Converts any valid number from 1 to 3999 into a Roman numeral.

Function Signature​

function convertToRomanNumerals(num: Numeric): string;

Parameters​

  • num — The numeric input (either number or numeric string) to be converted.

Returns​

  • A string representing the Roman numeral form of the number.

Throws​

  • RangeError — If the number is less than 1 or greater than 3999.

Examples​

convertToRomanNumerals(29); // "XXIX"
convertToRomanNumerals("1987"); // "MCMLXXXVII"
convertToRomanNumerals(3999); // "MMMCMXCIX"
convertToRomanNumerals(0); // throws RangeError

Aliases​

  • toRoman,
  • numberToRoman,
  • integerToRoman,
  • toRomanNumeral
  • numericToRoman

Notes​

  • Roman numerals were used in ancient Rome for counting and notation. This implementation supports only traditional Roman numerals (1–3999).
  • The conversion follows standard subtractive notation rules: e.g., 4 = IV, 9 = IX, 40 = XL, 90 = XC.
  • This function does not support numbers ≥ 4000 due to limitations in classical Roman numeral representation.

Conclusion​

Use convertToRomanNumerals when you need to represent numbers in Roman format — useful for page numbers, date stylization, clocks, or decorative number displays.