Key Features:
Two-way conversion:
Converts numbers (1-3999) to Roman numerals
Converts Roman numerals to numbers
Automatic detection of input type (number or Roman)
Pink color scheme (distinct from your other calculators)
Comprehensive validation:
Checks for valid numbers (1-3999)
Validates proper Roman numeral format
Responsive design matching your original style
Smart formatting:
Handles subtractive notation (IV = 4, IX = 9, etc.)
Properly converts all standard Roman numerals
Preserved all original terms and attribution
How It Works:
Detects if input is Arabic number or Roman numeral
For numbers → Roman:
Uses standard subtractive notation
Follows proper Roman numeral rules
For Roman → numbers:
Validates proper numeral sequence
Calculates value including subtractive combinations
Example Conversions:
2023 → "MMXXIII"
"MMXXIII" → 2023
49 → "XLIX" (not "IL")
999 → "CMXCIX"
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