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Roman Numeral Converter

Convert between Arabic numbers (1—999) and Roman numerals instantly. Works both ways.

Converter Tools Runs locally No data sent
roman numeralsconverternumbersbrowser only
Mode
Enter a number (1 —3999)
Roman numeral
—
Quick examples
Roman numeral reference
SymbolValueSymbolValue
I1L50
IV4XC90
V5C100
IX9CD400
X10D500
XL40CM900
—/td>—/td>M1000

What are Roman Numerals?

Roman numerals are a numeral system originating in ancient Rome that uses letters (I, V, X, L, C, D, M) to represent numbers. They are still widely used today in clock faces, movie credits, book chapters, and formal documents. This converter handles both directions: Arabic to Roman and Roman to Arabic, for all standard values from 1 to 3999.

How to Use Roman Numeral Converter

  1. Choose a mode: "Number →Roman" or "Roman →Number".
  2. Type your value into the input field, or click a quick example.
  3. The result appears instantly below.
  4. Click Copy to copy the result to your clipboard.

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Roman Numeral Rules ▾
Example
Input 2024
Output MMXXIV
Common Use Cases
  • Converting years for movie credits or book copyright lines
  • Reading clock faces and watch dials
  • Understanding historical dates and chapter numbering
  • Homework and school assignments
Frequently Asked Questions
What is the largest number supported?

The standard Roman numeral system supports 1 to 3999 (MMMCMXCIX). Numbers outside this range cannot be represented in classical Roman numerals.

How does subtractive notation work?

Instead of writing IIII for 4, Romans wrote IV (5 minus 1). Similarly, IX = 9, XL = 40, XC = 90, CD = 400, and CM = 900. This tool uses standard subtractive notation.

Can I convert Roman numerals back to numbers?

Yes. Switch to "Roman →Number" mode, enter a Roman numeral like MMXXIV, and the tool returns the Arabic equivalent (2024).

Is zero a Roman numeral?

No. The Roman numeral system has no symbol for zero. It was a later invention. This tool only supports 1—999.