15 in Decimal
Hexadecimal 15 equals 21 in decimal.
15 in all number bases
Decimal21
Hexadecimal0x15
Binary0001 0101
Octal25
How 15 converts from hexadecimal to decimal
Multiply each digit by 16 raised to its position (starting at 0 from the right), then add the results:
1× 161 = 1 × 16 = 16
5× 160 = 5 × 1 = 5
Sum: 21