Roman Numeral Converter
Convert between Roman numerals and decimal numbers. Supports values from 1 to 3999 with validation.
How to Use Roman Numeral Converter
The Roman Numeral Converter is a free online tool that converts between Roman numerals and decimal (Arabic) numbers. Switch between two modes: decimal to Roman (enter a number 1-3999 and get the Roman numeral) or Roman to decimal (enter a Roman numeral and get the number). Includes validation to ensure correct Roman numeral syntax. Whether you are studying history, working with clock faces, numbering chapters or outlines, decoding movie copyright dates, or learning Roman numerals for any purpose, this tool provides instant bidirectional conversion.
Step-by-Step Instructions
- Select conversion direction (Decimal → Roman or Roman → Decimal)
- Enter a number (1-3999) or a Roman numeral
- Click Convert to see the result
- Copy the converted value
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