321 in Roman Numerals
The number 321 is written CCCXXI in Roman numerals. Click the numeral below to copy it, or use the converter to try any other number.
CCCXXI uses 3 of the seven Roman numeral symbols and is 6 characters long.
CCCXXI is purely additive: every symbol is worth what it says and you simply add them together from left to right.
321 in Roman numerals
Also written in words as three hundred twenty-one, and read aloud as C C C X X I.
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 321 breaks down into Roman numerals
300 + 20 + 1 = 321, so CCC + XX + I = CCCXXI.
| Place value | Roman numeral | Why | Copy |
|---|---|---|---|
| 300 | CCC | C is 100, written 3 times | |
| 20 | XX | X is 10, written 2 times | |
| 1 | I | I is 1 |
No symbol on this page matches that search. Try a shorter word.
Numbers either side of 321
- 316 = CCCXVI
- 317 = CCCXVII
- 318 = CCCXVIII
- 319 = CCCXIX
- 320 = CCCXX
- 322 = CCCXXII
- 323 = CCCXXIII
- 324 = CCCXXIV
- 325 = CCCXXV
- 326 = CCCXXVI
Related numbers
Browse the full charts: Roman numerals hub, 1 to 100, years 1900 to 2100.
How to write 321 in Roman numerals, step by step
Roman numerals are built from largest value to smallest. Split 321 into place values first: 300 + 20 + 1.
Now swap each part for its symbols: 300 becomes CCC, 20 becomes XX, 1 becomes I. Written together that is CCCXXI.
No subtraction is needed here, so the symbols are simply added in descending order.
- 300 = CCC (C is 100, written 3 times)
- 20 = XX (X is 10, written 2 times)
- 1 = I (I is 1)
Is CCCXXI written correctly?
Yes. CCCXXI is the standard modern form of 321. 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 CCCXXI on a keyboard
Roman numerals are ordinary capital letters, so you can type CCCXXI directly: C, C, C, X, X, I. 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 CCCXXI
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 CCCXXI in a document, keep it in capitals. Lowercase roman numerals (cccxxi) are conventionally reserved for preliminary page numbering and sub-lists.
Frequently asked questions
How do you write 321 in Roman numerals?
321 is written CCCXXI. Break it into 300 + 20 + 1, then write CCC + XX + I, which joins up as CCCXXI.
What number is CCCXXI?
CCCXXI is 321, or three hundred twenty-one in words.
Is there another way to write 321 in Roman numerals?
CCCXXI is the standard form. Any other arrangement of the same symbols would break the rule that values are written from largest to smallest.
How do I copy CCCXXI?
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.