C is a single Roman symbol group for 100.
How 100 is written in Roman numerals
The number 100 is written C in Roman numerals. Roman numerals use seven letters — I (1), V (5), X (10), L (50), C (100), D (500) and M (1000) — combined from largest to smallest, with subtractive pairs such as IV (4) and IX (9). Need another number? Use the Roman numeral converter or see the 1–100 chart.
Building C step by step — take the largest value that fits, write its symbol, subtract, repeat.
| Write | Value | Remaining before | Remaining after |
|---|
| C | 100 | 100 | 0 |
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Frequently Asked Questions
What is 100 in Roman numerals?
100 in Roman numerals is C. It is written as one value group, C, worth 100 on its own, so nothing has to be added to it. The number below it, 99, is written XCIX, and the number above it, 101, is written CI.
How do you write 100 in Roman numerals?
Write 100 as C, a single Roman symbol group worth 100. Roman numerals are built by taking the largest value that still fits, writing its symbol and subtracting it, which reduces 100 in 1 step: C leaves 0. Every symbol keeps the same value wherever it stands, so the order is fixed and C is the only standard spelling of 100.
What are the Roman numerals either side of 100?
Either side of 100 the Roman numerals are XCIX for 99 and CI for 101, with C between them. Those three numerals are 4, 1 and 2 letters long, so the length changes as you count. Roman numerals have no digit positions, so each step can rewrite the numeral rather than bumping a single digit.
How is C read out loud?
C is read as the number it stands for, one hundred, and never letter by letter. Roman numerals are a way of writing values rather than a separate set of names, so the spoken form is the same whether the page shows 100 or C. A chapter or volume numbered C, for instance, is simply chapter one hundred.