Roman Numeral Converter
Convert between Roman numerals and regular numbers instantly.
How to use this tool
1
Open Roman Numeral Converter
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2
Enter your data
Paste or type your input. Results appear instantly.
3
Copy or download
Export your result with one click — ready to use anywhere.
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Why use this tool
100% in-browser
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Copy & download
Export results in one click, ready to paste anywhere.
FAQ
What is the largest Roman numeral?
Standard Roman numerals go up to 3,999 (MMMCMXCIX). Values above 3,999 require an overline notation, which is rarely used.
Why does 4 become IV not IIII?
The subtractive notation (IV for 4, IX for 9, XL for 40, etc.) was adopted for brevity. It is the standard in modern usage.
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