base 15 is a positional numeral system with fifteen as its base. It uses 15 different digits for representing numbers. The digits for base 15 could be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, and e.

conversion table

base 15	base 11	base 15	base 11
1	≈ 1	b	≈ 10
2	≈ 2	c	≈ 11
3	≈ 3	d	≈ 12
4	≈ 4	e	≈ 13
5	≈ 5	10	≈ 14
6	≈ 6	11	≈ 15
7	≈ 7	12	≈ 16
8	≈ 8	13	≈ 17
9	≈ 9	14	≈ 18
a	≈ a	15	≈ 19