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Roman Numeral Converter
One value per line: an integer 1–3999 → Roman numerals (subtractive notation: 4 = IV, 40 = XL, 900 = CM), or a Roman numeral → integer, validated strictly. 1994 ↔ MCMXCIV.
A little guidance. A better result.
How to use Roman Numeral Converter
Integer ↔ Roman numerals (1–3999), strict validation — 1994 ↔ MCMXCIV.
Prepare your input
Enter integers or Roman numerals, one per line.
Use the workspace
Review the converted values or validation messages.
Check your result
Check the result against your intended numbering scheme.
Know the limits
The supported integer range is 1–3999 using standard subtractive notation.
Where does my input go?
This browser tool processes your input on your device. Optional analytics is a separate choice; it is not needed to use the tool. Keep your original until you have checked the result.
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