15 = XV
15 in Roman numerals is XV.
Fifteen written with the letters X V.
15 in words: Fifteen
Fifteen in Roman numerals is XV, which is X (10) plus V (5). Like XI it is purely additive, ten and then five, so there is nothing to subtract and nothing to trip over. Two letters cover it, which is part of why it turns up so often.
XV carries a little extra weight because of the quinceanera, the fifteenth-birthday celebration frequently styled with the numeral, and because fifteen is a common chapter, level or edition number. Written cleanly it is one of the more elegant short numerals.
How 15 breaks down
Reading XV from left to right, each group is added together to reach 15:
| Group | Value | Place |
|---|---|---|
| X | 10 | tens |
| V | 5 | ones |
| XV | 15 | total |
Frequently asked questions
What is 15 in Roman numerals?
15 in Roman numerals is XV.
How do you write 15 in words?
15 is written "Fifteen" in English.
What number comes before XV?
The number before XV is 14, written XIV in Roman numerals.
What number comes after XV?
The number after XV is 16, written XVI in Roman numerals.
Related numbers
Last updated July 22, 2026. Reviewed for accuracy against the standard rules for Roman numerals.