Roman Numeral — XIII (13) — free printable diagram

What is XIII in Roman numerals?

XIII is the Roman numeral for 13 — thirteen. Written the other way round, 13 in Roman numerals is XIII.

Roman numeral

XIII

Number

13

In words

thirteen

Symbols used

I = 1, X = 10

Written as

X (10) + I (1) + I (1) + I (1)

• XIII is built from X (10) + I (1) + I (1) + I (1), which adds up to 13.
• Roman numerals are read from left to right, adding each symbol as you go, except where the subtraction rule applies.