Converters
Convert numbers to Roman numerals and Roman numerals back to standard numbers.
Use this Roman numeral converter to switch between standard number form and Roman numeral notation. It is useful for education, outlines, formatting, historical content, chapter numbering, and any workflow where Roman numerals still appear or need to be generated.
Use this Roman numeral converter to switch between standard number form and Roman numeral notation. It is useful for education, outlines, formatting, historical content, chapter numbering, and any workflow where Roman numerals still appear or need to be generated.
Use roman numeral converter when you need a fast browser-based result without extra setup. It works well for quick checks, one-off tasks, and routine formatting or calculation work.
Read step-by-step usage guidance, best practices, and common mistakes.
See common questions and answers about input, output, and tool usage.
Review practical input and output examples before running the tool.
Find similar and supporting tools for adjacent actions and follow-up tasks.
Input
14
Output
XIV
Converts a standard number into Roman numeral notation.
Input
XLII
Output
42
Converts a Roman numeral back into a standard number.
Fix: Use valid Roman numeral syntax such as IV, IX, XL, and so on.
Fix: Keep the input within the usual supported range unless the tool documents extended notation.
Fix: Use whole numbers only for standard Roman numeral conversion.
Yes. If you enter digits, it converts to Roman numerals. If you enter Roman numerals, it converts to a number.
The standard Roman numeral conversion works best for values from 1 to 3999.
It helps when reading or formatting outlines, dates, chapters, and traditional numbering systems.
Yes. It works online in the browser.
Roman numerals use letter-based notation such as IV or XII instead of positional decimal digits.