100 in Roman numerals

100 = C

Working: C = 100

The number 100 is written as C in Roman numerals.

Roman numerals are built by adding symbol values together from largest to smallest: C = 100. Where a smaller symbol appears before a larger one — as in IV for 4 or IX for 9 — it is subtracted rather than added, which keeps the notation short.

Structurally, C is 1 symbol long. It is entirely additive: every symbol adds to the running total, with no smaller symbol standing before a larger one. No symbol repeats.

C stands for centum, the Latin for hundred, and it is one of the two base symbols whose letter is a genuine abbreviation rather than an evolved shape. M for mille, a thousand, is the other. The rest — I, V, X, L, D — have less certain origins.

Nearby numbers

Number	Roman numeral
19	XIX
20	XX
25	XXV
30	XXX
40	XL
50	L
60	LX
90	XC

Try another value

Decimal number (1–3999)

Roman numeral

MMXXIV

Reference

X10

L50

C100

D500

M1000

Frequently asked questions

How do you write 100 in Roman numerals?

100 is written C. It breaks down as C = 100.

What are the seven Roman numeral symbols?

I is 1, V is 5, X is 10, L is 50, C is 100, D is 500, and M is 1,000. All Roman numerals are combinations of these seven symbols, and there is no symbol for zero.

For any other value, use the full Roman Numeral Converter on BrainVert.