109 in Roman Numerals
The number 109 is written CIX in Roman numerals. Click the numeral below to copy it, or use the converter to try any other number.
CIX uses 3 of the seven Roman numeral symbols and is 3 characters long.
Note the subtractive pair IX inside it: a smaller symbol placed before a larger one means subtract, which is why IX is 9 and not IIIIIIIII.
109 in Roman numerals
Also written in words as one hundred nine, and read aloud as C I X.
Roman numeral converter
Convert a number into Roman numerals, or read a Roman numeral back into a number. Works for 1 to 3999, the range the seven standard symbols can express.
How 109 breaks down into Roman numerals
100 + 9 = 109, so C + IX = CIX.
| Place value | Roman numeral | Why | Copy |
|---|---|---|---|
| 100 | C | C is 100 | |
| 9 | IX | IX is the subtractive form for 9 |
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Numbers either side of 109
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Browse the full charts: Roman numerals hub, 1 to 100, years 1900 to 2100.
How to write 109 in Roman numerals, step by step
Roman numerals are built from largest value to smallest. Split 109 into place values first: 100 + 9.
Now swap each part for its symbols: 100 becomes C, 9 becomes IX. Written together that is CIX.
The pair IX must stay in that order. IX means "one before 10", so it is read as 9.
- 100 = C (C is 100)
- 9 = IX (IX is the subtractive form for 9)
Is CIX written correctly?
Yes. CIX is the standard modern form of 109. A valid Roman numeral never repeats a symbol more than three times in a row, never repeats V, L or D at all, and only ever subtracts I, X or C, and only from the next two larger symbols.
Those rules are what keeps a number to a single accepted spelling, so a reader never has to guess.
How to type CIX on a keyboard
Roman numerals are ordinary capital letters, so you can type CIX directly: C, I, X. Nothing special is required and it will work in any font, any document and any web form.
Unicode also contains dedicated Roman numeral characters such as Ⅰ, Ⅴ, Ⅹ, Ⅼ, Ⅽ, Ⅾ and Ⅿ. They exist for typesetting East Asian text and they look almost identical, but search engines, spell checkers and screen readers handle the plain letters better, so the letters are usually the right choice.
Where you will see CIX
Numbers of this size turn up as chapter and page numbers in front matter, as list levels in outlines, as monarch and pope regnal numbers, and in the names of recurring events such as Super Bowl finals.
If you are using CIX in a document, keep it in capitals. Lowercase roman numerals (cix) are conventionally reserved for preliminary page numbering and sub-lists.
Frequently asked questions
How do you write 109 in Roman numerals?
109 is written CIX. Break it into 100 + 9, then write C + IX, which joins up as CIX.
What number is CIX?
CIX is 109, or one hundred nine in words.
Is there another way to write 109 in Roman numerals?
Not in standard use. CIX is the accepted form because Roman numerals subtract rather than repeat a symbol four times.
How do I copy CIX?
Click the large numeral at the top of this page. It copies straight to your clipboard, ready to paste anywhere.
Do Roman numerals have a zero?
No. The system has no symbol for zero and no way to write a negative number or a fraction of one, which is one reason it was replaced for arithmetic.