18 in Roman Numerals
Eighteen is written XVIII in Roman numerals. You read it left to right, adding each glyph in turn: X for 10, V for 5, I for 1, I for 1, I for 1.
How XVIII is formed
Reading left to right, 18 breaks into these additive parts. Each Roman symbol is added in turn to reach the total.
X + V + I + I + I = 10 + 5 + 1 + 1 + 1 = 18.
Where 18 in Roman numerals is used
- Chapter, act or appendix numbering in books and plays.
- Super Bowl XVIII and other numbered championship events.
- Outlines, exam questions and list items in formal documents.
- Monarch and pope names, for example the 18th of a royal line.
Good to know about 18
- Eighteen, XVIII, is the age of majority in many countries, a milestone-birthday numeral.
Convert another number
18 is written XVIII in Roman numerals.
Frequently asked questions
How do you write 18 in Roman numerals?
Write 18 as XVIII, combining X + V + I + I + I. Start from the largest value that fits and work down until nothing is left over.
Which Super Bowl is XVIII?
Super Bowl XVIII is the 18th Super Bowl, played in 1984. The NFL sets its championship number in Roman numerals, which is why so many people look up values like XVIII.
How do you say XVIII in words?
XVIII is 18, spoken as "eighteen". The numeral is read as the single value 18, not as its separate letters.
What are 17 and 19 in Roman numerals?
17 is XVII and 19 is XIX. Neighbouring numbers often change length in surprising ways, which is why each has its own page.