Roman Numeral Converter
Convert between Arabic numbers and Roman numerals instantly
Enter Number or Roman Numeral
Conversion Result
Result will appear here
Common Roman Numerals
| Arabic | Roman |
|---|---|
| 1 | I |
| 4 | IV |
| 5 | V |
| 9 | IX |
| 10 | X |
| 40 | XL |
| 50 | L |
| 90 | XC |
| 100 | C |
| 400 | CD |
| 500 | D |
| 900 | CM |
| 1000 | M |
| 2023 | MMXXIII |
How to use this converter:
- Enter either an Arabic number (e.g., 2023) or a Roman numeral (e.g., MMXXIII)
- Click Convert to Roman to convert Arabic numbers to Roman numerals
- Click Convert to Arabic to convert Roman numerals to Arabic numbers
- Click Clear to reset the converter
- View common examples in the table for reference
About Roman Numerals:
- Basic Symbols: 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)
- Additive Notation: III (3), XX (20), CC (200), MM (2000)
- Large Numbers: This converter supports values up to 3,999,999
- No Zero: The Romans had no symbol for zero
All conversions happen in your browser - no data is sent to any server