Decimal to Roman Numerals Converter [2025]

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Convert decimal numbers to Roman numerals with support for large numbers. Extended notation supports values up to 3,999,999 with bar notation.

✓ Large Number Support✓ Bar Notation✓ Thousands Separator

Understanding Roman Numerals

Basic Symbols

  • •

    Standard Numerals

    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)

  • •

    Repetition Rules

    Maximum three consecutive identical symbols

Extended Notation

  • •

    Bar Notation

    M̄ (1,000,000), D̄ (500,000), C̄ (100,000)

  • •

    Large Numbers

    Support for numbers up to 3,999,999

  • •

    Font Support

    Bar notation requires compatible font rendering

Usage Examples

Standard Numbers

  • • 1994 → MCMXCIV
  • • 2024 → MMXXIV
  • • 3999 → MMMCMXCIX
  • • 444 → CDXLIV
  • • 999 → CMXCIX

Large Numbers

  • • 4,000 → ĪV̄
  • • 10,000 → X̄
  • • 100,000 → C̄
  • • 500,000 → D̄
  • • 1,000,000 → M̄

Frequently Asked Questions

What's the largest number supported?

With large number support enabled, you can convert numbers up to 3,999,999. Without it, the maximum is 3,999 (standard Roman numeral limit).

What is bar notation?

Bar notation (vinculum) places a line over Roman numerals to multiply their value by 1,000. For example, V̄ represents 5,000.

Why don't some fonts show the bars correctly?

Bar notation uses Unicode combining characters which aren't supported by all fonts. For best results, use modern Unicode-compliant fonts.

Can Roman numerals represent zero or negative numbers?

No, the Roman numeral system doesn't have symbols for zero or negative numbers. It only represents positive integers.

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