Roman Numeral Converter
Convert between Roman numerals and Arabic numbers instantly. Free online Roman numeral converter.
Convert Roman / Arabic
Supports numbers 1-3,999,999. Use underscore for overline (e.g., _X = 10,000)
Reference Chart
Basic Symbols (1-1000)
Vinculum/Overline (x1000)
Using Vinculum (Overline)
For numbers larger than 3,999, Romans used a vinculum (overline) to multiply by 1,000.
Input format: Use underscore before a letter to indicate an overline.
How to Use
- Enter an Arabic number (1-3999) to convert to Roman numerals
- Or enter a Roman numeral to convert to an Arabic number
- Click the appropriate convert button
- View the result and conversion explanation
What is Roman Numeral Converter?
Roman numerals are a numeral system that originated in ancient Rome. They use letters from the Latin alphabet (I, V, X, L, C, D, M) to represent values. Roman numerals are still used today for clock faces, book chapters, movie sequels, and formal documents.
Formula
Roman Numeral Values:
I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000
Subtractive Notation:
IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900
Examples
- 2024 = MMXXIV (M+M+X+X+IV)
- 1999 = MCMXCIX (M+CM+XC+IX)
- 49 = XLIX (XL+IX)
- 444 = CDXLIV (CD+XL+IV)