Roman Numeral Converter

Free Roman Numeral Converter

Roman numerals still appear on clocks, book chapters, movie sequels, Super Bowls and monuments. Enter a number to get its Roman numeral, or type a numeral such as MCMXCIV to get the number.

The converter follows the standard subtractive rules (IV, IX, XL, XC, CD, CM) and validates input, so an invalid numeral like IIII or VX is flagged instead of guessed.

Key features

How to use it

1. Type a number or a Roman numeral.
2. Read the converted result.
3. Use the reference chart to learn the pattern.

Worked example

Example

2024 → MMXXIV
1994 → MCMXCIV
49   → XLIX
XIV  → 14

Who uses this tool

Tips for the best results

• Only I, X, C and M can repeat, up to three times in a row.
• Subtractive pairs are IV, IX, XL, XC, CD and CM.
• For numbers of 4,000 and above, an overline multiplies by 1,000.
• Use uppercase letters — lowercase is only for special styles.

Common mistakes to avoid

• Writing IIII instead of IV (except on some clock faces).
• Using invalid pairs such as IC for 99 (correct: XCIX).
• Trying to write zero — Roman numerals have no zero.

Frequently asked questions