Decimal to Roman Numeral Converter

This tool supports number conversion within the range of 1-3999. This is because the traditional Roman numeral system is standardized and practical within this range. Numbers beyond this range had different representations in ancient Roman numerals, but they are less commonly used today.

Roman numerals consist of seven basic symbols: I(1), V(5), X(10), L(50), C(100), D(500), M(1000). Combination rules: repeated identical symbols are added; a smaller symbol to the right of a larger symbol is added; a smaller symbol to the left of a larger symbol is subtracted.

Batch conversion supports multiple separators: line breaks, spaces, commas, and tabs. You can enter one number per line or separate multiple numbers on the same line with spaces or commas. The system will automatically recognize and process them.

Text files in txt and csv formats are supported. The file content should be plain text containing the numbers to be converted, separated by line breaks, spaces, or commas. It is recommended that the file size not exceed 1MB to ensure good processing performance.

The conversion steps feature helps you understand the process of converting numbers to Roman numerals, showing the numerical components corresponding to each Roman character. This is very helpful for learning Roman numeral rules, verifying conversion accuracy, and teaching purposes.

The downloaded archive includes result files in both CSV and TXT formats. The CSV file is suitable for opening in spreadsheet software and contains information such as input, output, conversion type, and steps. The TXT file is in plain text format, making it easy to view and print.

The system only accepts Roman numeral formats that follow standard rules. Common errors include using non-Roman numeral characters, violating subtraction rules (for example, using IC to represent 99 is incorrect; it should be XCIX), or entering numbers outside the supported range of 1-3999.