A Octal can be converted to BCD in three steps:-
Let's say your Octal value is
1617 and you want to convert it to it's BCD form.
Octal number system is composed of digits from 0 to 7. It has a base of 8 hence the name Octal.
Binary Coded Decimal or BCD is a set of binary encodings for decimal numbers used in early digital computers. In BCD, a binary sequence is used to represent each digit of the source decimal number