100 = C
100 in Roman numerals is C.
One hundred written with the letters C.
100 in words: One hundred
One hundred in Roman numerals is C, a single letter taken from the Latin centum, meaning hundred. It is one of the seven core symbols, so there is nothing to build: the letter C carries the value one hundred on its own.
Because it is a base symbol, C sits inside a huge share of larger numerals, from CL (150) to CM (900). It also stands for a century and, informally, a hundred-dollar bill, the "C-note". Knowing C on sight makes the whole hundreds range quick to read.
How 100 breaks down
Reading C from left to right, each group is added together to reach 100:
| Group | Value | Place |
|---|---|---|
| C | 100 | hundreds |
| C | 100 | total |
Frequently asked questions
What is 100 in Roman numerals?
100 in Roman numerals is C.
How do you write 100 in words?
100 is written "One hundred" in English.
What number comes before C?
The number before C is 99, written XCIX in Roman numerals.
What number comes after C?
The number after C is 101, written CI in Roman numerals.
Related numbers
Last updated July 22, 2026. Reviewed for accuracy against the standard rules for Roman numerals.