Roman Numeral Converter Online

How to Use

1. Choose your conversion mode:
   • Decimal to Roman: Convert numbers to Roman numerals
   • Roman to Decimal: Convert Roman numerals to numbers
2. Enter your number or Roman numeral
3. Set display options if needed
4. Click "Convert" to see the result
5. Use "Copy to Clipboard" to save the result

Roman Numeral Rules

• Basic Symbols:
  • I = 1
  • V = 5
  • X = 10
  • L = 50
  • C = 100
  • D = 500
  • M = 1000
• Subtractive Notation:
  • IV = 4 (5-1)
  • IX = 9 (10-1)
  • XL = 40 (50-10)
  • XC = 90 (100-10)
  • CD = 400 (500-100)
  • CM = 900 (1000-100)

Common Uses

• Historical Dates - Convert years to Roman numerals
• Document Formatting - Create chapter numbers
• Education - Learn Roman numeral system
• Publishing - Format page numbers
• Design - Create classical-style numbering

Tips and Tricks

• Use uppercase for traditional Roman numerals
• Enable breakdown to understand the conversion
• Add spaces for better readability
• Remember the subtractive notation rules
• Numbers must be between 1 and 3999