15 in Roman numerals

15 = XV

Working: X = 10, V = 5

The number 15 is written as XV in Roman numerals.

Roman numerals are built by adding symbol values together from largest to smallest: X = 10, V = 5. Where a smaller symbol appears before a larger one — as in IV for 4 or IX for 9 — it is subtracted rather than added, which keeps the notation short.

Structurally, XV is 2 symbols long. It is entirely additive: every symbol adds to the running total, with no smaller symbol standing before a larger one. No symbol repeats.

XV is ten plus five, purely additive and among the shortest two-symbol numerals in the teens. Its brevity is why it turns up so often in branding and in event numbering, where a compact numeral reads better than a long one.

Nearby numbers

Number	Roman numeral
10	X
11	XI
12	XII
14	XIV
16	XVI
18	XVIII
19	XIX
20	XX

Try another value

Decimal number (1–3999)

Roman numeral

MMXXIV

Reference

X10

L50

C100

D500

M1000

Frequently asked questions

How do you write 15 in Roman numerals?

15 is written XV. It breaks down as X = 10, V = 5.

What are the seven Roman numeral symbols?

I is 1, V is 5, X is 10, L is 50, C is 100, D is 500, and M is 1,000. All Roman numerals are combinations of these seven symbols, and there is no symbol for zero.

For any other value, use the full Roman Numeral Converter on BrainVert.