Roman Numeral Converter

Convert regular numbers to Roman numerals instantly. Supports standard notation (1-3,999) and vinculum notation for larger numbers (up to 3,999,999). Save your conversions, download as text files, and manage your conversion history locally with full privacy.

I
1
V
5
X
10
Instant conversion for 1-3999

The Bottom Line

This Roman numeral converter instantly transforms regular numbers into their Roman numeral equivalents. Supports standard notation (1-3,999) and vinculum (overline) notation for larger numbers up to 3,999,999. Type any number and see the conversion appear in real-time. Save frequently used conversions to a list stored locally in your browser. Export options include copying individual conversions, bulk copying all conversions, or downloading as a text file. Perfect for educational purposes, historical documents, clock faces, or any project requiring Roman numerals. Completely privacy-focused—all processing and storage happens in your browser with no server uploads or external API calls.

Number to Roman Numeral

The vinculum is an overline that multiplies values by 1,000 (e.g., V̅ = 5,000)

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Problems This Roman Numeral Converter Solves

  • Eliminates manual Roman numeral conversion errors - Stop calculating Roman numerals by hand and risking mistakes. Convert instantly with perfect accuracy every time.
  • Saves time for historical documents - Quickly convert dates and numbers for historical papers, academic work, or period-accurate documents without consulting conversion tables.
  • Prevents duplicate conversion work - Save frequently used conversions to avoid repeating the same calculations. Perfect for recurring numbers in your projects.
  • Streamlines clock and watch design - Generate Roman numerals for clock faces and timepiece designs without manual lookup or conversion.
  • Simplifies educational exercises - Teachers and students can quickly verify Roman numeral homework and practice problems with instant conversion.
  • Ensures format consistency - Get standardized Roman numeral formatting every time, eliminating concerns about subtractive notation rules.
  • Enables bulk conversion - Convert multiple numbers and export all at once as a text file for batch processing in documents or designs.
  • Maintains complete privacy - All conversions and storage happen in your browser. No data is uploaded to servers, perfect for sensitive or proprietary work.
  • Works offline after loading - Convert and save Roman numerals with no internet connection required. Perfect for fieldwork or low-connectivity environments.
  • Removes dependency on reference tables - No need to memorize or look up Roman numeral rules. Just type a number and get the correct Roman representation.