Roman Numeral Converter
Convert between decimal numbers and Roman numerals in both directions.
Roman Numeral
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Decimal Number
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Quick Reference
I
1
V
5
X
10
L
50
C
100
D
500
M
1000
How to Use Roman Numeral Converter
Step 1
Enter a decimal number (1-3999) to convert to Roman numerals.
Step 2
Or enter a Roman numeral to convert to a decimal number.
Step 3
The result appears instantly as you type.
Step 4
Click the copy button to copy the result to your clipboard.
Features
Two-way conversion: decimal to Roman and Roman to decimal.
Supports values from 1 to 3999.
Real-time conversion as you type.
Input validation with clear error messages.
Copy buttons for quick clipboard access.
FAQ
The converter supports numbers from 1 to 3999. Standard Roman numeral notation does not have a way to represent zero or numbers above 3999.
Roman numerals use seven symbols: I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). Subtractive notation is used for values like 4 (IV) and 9 (IX).
Yes. Both directions convert in real time as you type, with validation for invalid inputs.
Yes, the Roman numeral converter is completely free and runs entirely in your browser.