What is Octal?

Octal is a number system that uses eight digits: 0, 1, 2, 3, 4, 5, 6 and 7. It is also known as base 8 numbering system since it is based on 8 following symbols: 0, 1, 2, 3, 4, 5, 6 and 7.

What is Decimal?

Decimal is a number system that uses ten digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. It is also known as base 10 numbering system since it is based on 10 following symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.

How to convert Octal to Decimal?

To convert Octal to Decimal, we need to multiply each Octal value to it's place value and add all the results together.

Example

Let's convert the Octal value 12 to Decimal.

First, we need to multiply each Octal value to it's place value.

Octal Value	Place Value	Result
1	$8^1$	8
2	$8^0$	2

Now, we need to add all the results together to get the final Decimal value. In this case, the final Decimal value is 10. This is the Decimal representation of the Octal value 12.