Binary to Octal Converter
What is a Binary Number?
A binary number is a number expressed in the base2 numeral system, which uses only two symbols: 0 and 1. In the binary system, each digit is referred to as a 'bit' and can hold one of two values  0 or 1.
Some key properties of binary numbers:

Binary digits (bits) can only take on one of two values: 0 or 1

Each bit represents a power of 2, with the rightmost bit representing 2^0

Binary numbers allow computer hardware and software to encode data in the simplest form using electrical signals that have two states  on or off
For example, the binary number 10100 can be understood as:
1 x 2^4 + 0 x 2^3 + 1 x 2^2 + 0 x 2^1 + 0 x 2^0
Which has a decimal value of 20.
What is an Octal Number?
An octal number is a number expressed in base8 numeral system, which uses eight unique digits from 0 to 7. In the octal system, each digit represents a power of eight.
Some key properties of octal numbers:

Octal digits can take on one of eight values from 0 to 7

Each octal digit represents a power of 8, with the rightmost digit representing 8^0

Octal is sometimes used in computing over hexadecimal as it can more easily represent binary numbers
For example, the octal number 237 can be understood as:
2 x 8^2 + 3 x 8^1 + 7 x 8^0
Which has a decimal value of 151.
How to Convert Binary to Octal
Converting a binary number to an octal number is the process of transforming a number expressed in base 2 into a number expressed in base 8.
To convert binary to octal:

The binary number can be grouped into sets of three digits, padding the most significant digit with zeros if needed.

Each group of three binary digits (bits) can represent one octal digit.

The pattern of 0s and 1s in each group of three binary bits is then converted directly to its equivalent octal digit from 0 to 7.
By applying this process to all groups of three bits, the full binary number can be converted into its equivalent base8 (octal) representation.
The Binary to Octal Conversion Formula
The general formula for converting binary to octal is:
Octal = (B2B1B0)2
Where:

B2 is the most significant (leftmost) binary bit

B1 is the middle binary bit

B0 is the least significant (rightmost) binary bit
Each bit pattern of three binary digits can be converted directly to the equivalent octal digit through this formula.
StepbyStep Guide to Converting Binary to Octal
Converting binary to octal can be broken down into three key steps:
Grouping Binary Digits
First, the binary number should be grouped into sets of three digits, padding with leading zeros if needed. For example:
1011012 = 00101 101 1012
Converting Binary Groups to Octal
Next, each group of three binary digits is converted to its equivalent octal representation from 0 to 7:
00101 101 1012 = 5 1 52
Putting it All Together
The octal digits can then be combined to form the final octal number:
00101 101 1012 = 515
By following these key steps, any binary number can be converted to a base8 octal number.
Conclusion
Converting binary to octal provides a straightforward process for transforming between two important numerical bases used in computing and digital logic systems.
By grouping binary digits, mapping bit patterns, and combining the octal equivalents, any binary number can be converted to a base8 representation.
With some practice over several examples, the conversion process will become second nature, providing a useful skill for computer science and engineering applications.
Alex Smith
Founder
I build online web software to simplify and solve daily life problems.