Why use this calculator
Roman numerals appear on clock faces, building inscriptions, movie copyright dates, Super Bowls, and document numbering. This converter instantly translates between Roman numerals and regular numbers in both directions.
How to use it
Select your conversion direction: type a number (1-3999) to see its Roman numeral, or type a Roman numeral string to find its value. The converter handles all standard subtractive notation (IV=4, IX=9, XL=40, XC=90, CM=900).
The formula
Roman numerals use 7 symbols: I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Subtractive notation: when a smaller value precedes a larger one, subtract it (IV=4, XL=40, CM=900).
Worked examples
Number: 2024
MMXXIV
Roman: MCMXCIX
1999
Roman: XLII
42
When people use it
- Decoding movie copyright years
- Reading clock faces
- Understanding historical dates
- Numbering document chapters or outlines
Tips
- The largest standard Roman numeral is MMMCMXCIX = 3,999
- There is no zero in Roman numerals
- Subtractive pairs: IV (4), IX (9), XL (40), XC (90), CD (400), CM (900)
- Roman numerals are still used for Super Bowls, Olympics, and papal names
Questions people ask
- What is the Roman numeral for 2024?
- 2024 in Roman numerals is MMXXIV. M=1000, M=1000, X=10, X=10, IV=4.
- What is the largest number in Roman numerals?
- Using standard notation, the largest Roman numeral is MMMCMXCIX = 3,999. Numbers above 3,999 traditionally used a bar over numerals to indicate ×1,000.
- Why are Roman numerals still used?
- Roman numerals convey tradition and formality. They appear on clock faces (XII=12), movie copyright dates, Super Bowls (LVIII), book chapters, and official documents.