Roman Numeral Converter
Convert between Roman numerals and Arabic numbers in both directions.
Arabic Number → Roman Numeral
Roman Numeral → Arabic Number
Common Roman Numerals
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How to Use This Tool
- Enter a Roman numeral (like XIV) to convert it to an Arabic number.
- Or enter an Arabic number (like 2024) to convert it to Roman numerals.
- View the conversion result instantly.
- Use it for dates, clock faces, outline numbering, or historical research.
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Frequently Asked Questions
What are Roman numerals?
Roman numerals are a numeral system originating in ancient Rome, using combinations of letters: I (1), V (5), X (10), L (50), C (100), D (500), and M (1000).
What is the largest number this converter handles?
This converter supports numbers from 1 to 3,999,999. Standard Roman numerals go up to 3,999, and this tool extends that with overline notation for larger numbers.
How do Roman numerals work?
Roman numerals are read left to right, with values added together. When a smaller numeral appears before a larger one, it's subtracted (e.g., IV = 4, IX = 9, XL = 40).
Where are Roman numerals used today?
Roman numerals are still used for clock faces, movie copyright dates, book chapters, monarch numbering (Queen Elizabeth II), Super Bowl numbering, and formal outline structures.
What is the largest Roman numeral this tool can convert?
Our Roman numeral converter handles numbers from 1 to 3,999 (MMMCMXCIX), which covers the standard range of Roman numerals. For larger numbers, Roman numeral notation becomes non-standard.