XII is the Roman numeral for 12 — 10 + 1 + 1.

How do you write 12 in Roman numerals?

Take the largest value that fits and repeat until nothing is left: X (10), then I (1), then I (1). That gives XII.

12 in Roman numerals

XII

Number (1–3,999 for numerals)

Roman numeral

12 is written XII in Roman numerals. That is 3 symbol groups added together, reading left to right from the largest value down.

How it breaks down

XII = 10 + 1 + 1 = 12
Group	Value	Subtraction	Running total
X	10	—	10
I	1	—	11
I	1	—	12

No subtraction needed

XII is purely additive — every symbol is simply added to the one before it, with no subtractive pairs like IV or IX. Numbers avoid subtraction when none of their digits is a 4 or a 9.

The symbols

Symbol	Value	Used here
I	1	yes — 2×
V	5	no
X	10	yes — 1×
L	50	no
C	100	no
D	500	no
M	1,000	no

The same number, other ways

In words: Twelve
Roman numeral: XII
Symbol count: 3 characters
Binary: 1100
Hexadecimal: C

The numbers either side

Number	Roman numeral
10	X
11	XI
12	XII ←
13	XIII
14	XIV

Common questions

What is 12 in Roman numerals?: 12 is XII.
What does XII mean?: XII is the Roman numeral for 12 — 10 + 1 + 1.
How do you write 12 in Roman numerals?: Take the largest value that fits and repeat until nothing is left: X (10), then I (1), then I (1). That gives XII.

Sources

Calculated on this page — At One Place

How these figures are compiled and checked