What is 100 in Roman numerals?

100 is written C in Roman numerals.

Number

100 in Roman numerals

100 is written C

Type any other number or numeral below to convert it.

Above 3,999? Type the barred part in brackets, e.g. (IV)CC = 4,200.

Roman numerals are written one decimal place at a time, largest first.

There's no letter for zero. The zeros are simply left out, which is why 100 has 1 part, not 3.

100 is even and can be split into prime factors: 2 × 2 × 5 × 5, or in Roman numerals II × II × V × V.
100 is a square number: 10 × 10 (X × X).
C is a single letter, one of only seven in the system: I, V, X, L, C, D and M.