Roman Numeral ↔ Number Converter
Convert any number (1–3999) to Roman numerals and back. Validates canonical form and suggests corrections for non-canonical input.
Runs 100% in your browser — nothing is uploaded.
Result
MMXXVI
Frequently asked
Why cap at 3999?
Classical Roman numerals only go up to 3999 (MMMCMXCIX). Numbers above use overlines/parentheses that don't translate well to text.
What is "canonical form"?
Each Roman numeral has exactly one correct spelling — e.g., IX (not VIIII), CM (not DCCCC). The tool validates against canonical form and suggests corrections.
Related tools
- Base ConverterConvert numbers between binary, octal, decimal, and hexadecimal. Supports huge n
- Universal Unit ConverterConvert between units across 8 dimensions: length, mass, volume, time, area, dig
- Cron BuilderPick a preset or enter your own fields to build a cron expression. Includes a pl
- CSS Beautifier & MinifierBeautify minified CSS with proper indentation, or minify pretty CSS to a single
- Hash GeneratorInstantly compute MD5 and SHA-family hashes of any text. All hashing happens in
- HTML Beautifier & MinifierBeautify minified HTML with proper indentation, or minify pretty HTML for produc