18 in Roman Numerals

18 in Roman numerals is
XVIII
10 + 5 + 1 + 1 + 1 = 18
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The number 18 is written XVIII in Roman numerals. Reading left to right and adding the values gives 10 + 5 + 1 + 1 + 1 = 18. Roman numerals use seven letters: I (1), V (5), X (10), L (50), C (100), D (500) and M (1000). A smaller letter before a larger one means subtraction (IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900).

XVIII in names

  • Louis XVIII of France, King of France and Navarre from 1814 to 1815 and from 1815 to 1824 (1755-1824). Wikidata
  • John XVIII, pope of the Catholic Church. Wikidata
  • Super Bowl XVIII, played on 22 January 1984. Wikidata

Popes, monarchs, films and Super Bowls whose name carries XVIII. Source: Wikidata, retrieved 11 October 2026.

Nearby & popular values

16 = XVI17 = XVII19 = XIX20 = XX
4 = IV9 = IX14 = XIV40 = XL49 = XLIX90 = XC99 = XCIX100 = C500 = D1000 = M1984 = MCMLXXXIV1990 = MCMXC1999 = MCMXCIX2000 = MM2024 = MMXXIV2025 = MMXXV2026 = MMXXVI3999 = MMMCMXCIX

Frequently asked

What is 18 in Roman numerals?

18 in Roman numerals is XVIII.

How is 18 written in Roman numerals?

18 is written XVIII, which breaks down as 10 + 5 + 1 + 1 + 1 = 18.

Is there a Roman numeral for zero?

No. The Roman system has no symbol for zero, which is one reason it was eventually replaced for calculation.