Roman Numeral Converter
Convert between Arabic numbers and Roman numerals (1�?999).
Roman Numeral
Roman-
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Arabic Number
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About Roman Numeral Converter
What is a Roman Numeral Converter?
A Roman numeral converter translates numbers between the modern Arabic numeral system and the ancient Roman numeral system.
How to Use
Choose a direction, enter a value, and click Convert. The tool shows the result and a step-by-step breakdown or validation message.
FAQ
What is the largest number supported?
This tool supports numbers from 1 to 3999, the standard range for classic Roman numerals.
Is lowercase input accepted?
Yes, lowercase letters are converted to uppercase automatically.
How are subtractive pairs handled?
The converter correctly uses IV, IX, XL, XC, CD, and CM in results and validates them in input.