Roman Numeral Converter – Convert Numbers to Roman Numerals Instantly
Convert any number (1–3999) to Roman numerals or convert Roman numerals back to decimal numbers. Free, instant, no signup required.
Roman Numeral Reference Table
| Roman | Decimal | Roman | Decimal |
|---|
| I | 1 | L | 50 |
| V | 5 | C | 100 |
| X | 10 | D | 500 |
| IV | 4 | M | 1000 |
| IX | 9 | CM | 900 |
| XL | 40 | CD | 400 |
Common Roman Numerals
| Number | Roman | Number | Roman |
|---|
| 2024 | MMXXIV | 100 | C |
| 2025 | MMXXV | 500 | D |
| 1999 | MCMXCIX | 1000 | M |
| 14 | XIV | 42 | XLII |
💡 Roman numerals are still used today for clock faces, book chapters, movie sequels (Rocky IV), Olympic Games years, and Super Bowl numbering (Super Bowl LIX).
Frequently Asked Questions
What is the Roman numeral for 2025?2025 in Roman numerals is MMXXV. M=1000, M=1000, X=10, X=10, V=5.
Why is 4 written as IV and not IIII?IV uses the subtractive notation — placing a smaller numeral before a larger one means subtract. IV = 5 − 1 = 4. This rule applies to IX (9), XL (40), XC (90), CD (400), CM (900).
What is the largest Roman numeral?The standard Roman numeral system goes up to 3,999 (MMMCMXCIX). Numbers beyond this require special notations not covered in standard usage.