Roman Numeral Converter – Convert Numbers to Roman Numerals

Our Roman Numeral Converter lets you convert any number between 1 and 3999 to Roman numerals and decode any Roman numeral string back to its decimal value — instantly.

Roman Numeral Quick Reference

| Symbol | Value |
|--------|-------|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |

Subtractive Notation

Roman numerals use subtractive notation for certain values — IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900.

Common Uses

- Understanding copyright years (MMXXVI = 2026)
- Movie sequel numbering (Super Bowl LX)
- Clock faces and book chapter numbering
- Historical dates in academic writing
- Architectural inscriptions

Bidirectional Conversion

Convert Arabic to Roman (123 → CXXIII) or Roman to Arabic (CXXIII → 123) with a single toggle.