🏛️ Roman Numerals Converter

🔢 Input

💡 Auto-detects input type - enter numbers or Roman numerals

🔄 Conversion Direction

⚙️ Display Options

Show conversion steps Show numeral breakdown Show historical facts Show alternative representations

💡 Example Numbers

✨ Conversion Result

{{ result.input_type ==='arabic' ?'Arabic Number' :'Roman Numeral' }}

{{ result.output_type ==='arabic' ?'Arabic Number' :'Roman Numeral' }}

{{ result.output_type ==='arabic' ? result.arabic_number : result.roman_numeral }}

📋 Conversion Steps

Result: {{ step.result_so_far }}

Running total: {{ step.running_total }}

🔍 Numeral Analysis

Length: {{ result.breakdown.length }} characters

Character Usage:

× {{ count }}

Subtractive Notation:

{{ sub.pattern }} → {{ sub.meaning }}

🏛️ Historical Facts

• {{ fact }}

🔢 Alternative Representations

Binary: {{ result.alternative_representations.binary }}

Octal: {{ result.alternative_representations.octal }}

Hexadecimal: {{ result.alternative_representations.hexadecimal }}

Ordinal: {{ result.alternative_representations.ordinal }}

Words:

⚠️ {{ error }}

ℹ️ About Roman Numerals Converter

Roman numerals write whole numbers with Latin letters instead of positional digits. The conventional symbols are I, V, X, L, C, D, and M, which represent 1, 5, 10, 50, 100, 500, and 1000. Use this converter for Arabic-to-Roman conversion, Roman-to-Arabic validation, date labels, outline numbering, chapter numbers, clock-face checks, and inscription-style formatting.

Modern Roman numeral usage is conventional rather than a single web standard, but the core symbols and additive/subtractive patterns are documented by references such as Britannica's Roman numeral overview and the Unicode Number Forms chart. For interoperable text, prefer ASCII letters like MMXXIV over compatibility characters such as Ⅻ unless you specifically need those Unicode glyphs.

Symbol values:

I = 1 - ones place
V = 5 - five
X = 10 - tens place
L = 50 - fifty
C = 100 - hundreds place
D = 500 - five hundred
M = 1000 - thousands place

Standard range and validation rules:

Standard numerals are written from largest to smallest, left to right: 2024 = MMXXIV.
The accepted subtractive pairs are IV, IX, XL, XC, CD, and CM.
I, X, C, and M can repeat up to three times in a row; V, L, and D are not repeated.
This tool supports the common 1-3999 range, so MMMCMXCIX is the largest standard value.
Zero, negative numbers, fractions, decimals, and overline/vinculum notation for 5000+ are outside the supported range.

Examples: 4 = IV, 9 = IX, 44 = XLIV, 944 = CMXLIV, and 1994 = MCMXCIV. Some clocks and historic inscriptions use non-standard additive forms such as IIII for 4; this converter focuses on the canonical subtractive forms used for validation and search-friendly conversion.

API Usage Example:

POST /api/tools/conversion/roman-numerals
Content-Type: application/json

{
    "input": "2024",
    "direction": "auto"
}