Roman Numeral — XVIII (18) — free printable diagram

What is XVIII in Roman numerals?

XVIII is the Roman numeral for 18 — eighteen. Written the other way round, 18 in Roman numerals is XVIII.

Roman numeral

XVIII

Number

18

In words

eighteen

Symbols used

I = 1, V = 5, X = 10

Written as

X (10) + V (5) + I (1) + I (1) + I (1)

• XVIII is built from X (10) + V (5) + I (1) + I (1) + I (1), which adds up to 18.
• Roman numerals are read from left to right, adding each symbol as you go, except where the subtraction rule applies.