Roman Numeral Converter
Online two-way converter between Arabic and Roman numerals, supporting values from 1 to 3999.
Conversion
Roman Numeral Reference Table
Features
The Roman numeral converter supports two-way real-time conversion between Arabic numerals (1-3999) and Roman numerals. Roman numerals originated in ancient Rome and use seven basic symbols (I, V, X, L, C, D, M) combined by specific rules to represent values.
How to Use
- Enter an Arabic numeral on the left; the corresponding Roman numeral appears on the right automatically.
- Enter a Roman numeral on the right (case insensitive); the corresponding Arabic numeral appears on the left automatically.
- Input range is limited to 1 through 3999.
- An error message is displayed for invalid Roman numeral formats.
Usage Instructions
Features
The Roman numeral converter supports two-way real-time conversion between Arabic numerals (1-3999) and Roman numerals, and provides a reference table of the seven basic symbols (I, V, X, L, C, D, M).
Steps
Enter an Arabic numeral on the left to get the Roman numeral, or enter a Roman numeral on the right (case insensitive) to get the Arabic numeral; the table at the bottom shows the value of each symbol.
Notes
All conversions run locally in the browser; the input range is limited to 1-3999, and invalid Roman numeral formats display an error message.