2009 in Roman numerals at a glance
- Roman numeral
- MMIX
- Lowercase
- mmix
- Letters
- 4
- Parts
- M · M · IX
- Subtractive pairs
- IX
- Read aloud
- two thousand nine
- Leap year?
- No
How MMIX is built
Roman numerals are written one decimal place at a time, from the largest place to the smallest. Converting each digit of 2009 separately and joining the pieces gives MMIX:
| Place | Digit | Value | Numeral |
|---|---|---|---|
| Thousands | 2 | 2,000 | MM |
| Hundreds | 0 | 0 | — (zero has no symbol) |
| Tens | 0 | 0 | — (zero has no symbol) |
| Ones | 9 | 9 | IX |
Reading it back, left to right:
- M = 1,000 → running total 1,000
- M = 1,000 → running total 2,000
- IX = 9 (X minus I) → running total 2,009
Why MMIX has 4 letters
Every year from 2000 to 2099 begins with MM (2,000); the rest of MMIX after MM — IX — spells out 9. Of the 201 years from 1900 to 2100, 178 have a longer numeral and 7 a shorter one.
The rules MMIX follows
- Largest to smallest. MMIX uses the symbols M, I and X (4 characters in all), and the values never increase from left to right except inside a subtractive pair.
- Subtraction. IX (9) is a subtractive pair: a smaller symbol in front of a larger one is taken away from it. Only six pairs are allowed — IV, IX, XL, XC, CD and CM — and MMIX uses one of them.
- Repetition. MM repeats M two times. I, X, C and M may repeat up to three times in a row; V, L and D never repeat.
Common mistakes when writing 2009
- MMVIIII — wrong because standard numerals never repeat a symbol four times; 9 is written IX. The correct form is MMIX.
The year 2009 in Roman numerals: where it appears
- Credits, diplomas and keepsakes. Many productions still print the copyright year as a numeral, and recent dates such as MMIX are popular for wedding bands, tattoos and anniversary gifts.
- Championship numbering. The pro football championship played in early 2009 was game XLIII (43), since the series began with game I in January 1967.
- On a calendar. 2009 was not a leap year (365 days), and January 1 fell on a Thursday. A full date such as July 4, 2009 is often written VII · IV · MMIX.
To turn a complete birth date or wedding date into numerals — with dots, dashes or spaces in US or day-first order — use the Roman numeral date converter.
Years around 2009 in Roman numerals
| Year | Roman numeral | Letters |
|---|---|---|
| 2004 | MMIV | 4 |
| 2005 | MMV | 3 |
| 2006 | MMVI | 4 |
| 2007 | MMVII | 5 |
| 2008 | MMVIII | 6 |
| 2009 | MMIX | 4 |
| 2010 | MMX | 3 |
| 2011 | MMXI | 4 |
| 2012 | MMXII | 5 |
| 2013 | MMXIII | 6 |
| 2014 | MMXIV | 5 |
Frequently asked questions
How do you write 2009 in Roman numerals?
2009 is written MMIX. Break it into M (1000), M (1000), IX (9) and add the parts: 1000 + 1000 + 9 = 2009.
Is MMVIIII a correct way to write 2009?
No. MMVIIII is wrong because standard numerals never repeat a symbol four times; 9 is written IX. The standard numeral for 2009 is MMIX.
How do you say MMIX?
Read the value, not the letters: MMIX is the year 2009, said “two thousand nine.” Spelling out the letters one by one is only useful when checking a carving or engraving.
What year comes after MMIX?
2010, written MMX. The year before, 2008, is MMVIII.