Binary to Octal Converter
Type a binary number to see it in octal. Below: how the conversion works, a worked example and a conversion table.
11111111 binary = 377 octal
How to convert binary to octal
Split the binary number into groups of 3 digits starting from the right, and replace each group with its octal digit. (Or: multiply each digit by 2 raised to the power of its position (counting from 0 on the right) and add the results, then divide the number by 8 again and again and write down the remainders; read in reverse order, the remainders are the octal digits.)
Example: 11111111 to octal
Because 8 = 23, every octal digit stands for exactly 3 binary digits. Split the binary number into groups of 3 from the right (adding leading zeros), then write each group as one octal digit:
| Binary group | Octal digit |
|---|---|
011 | 3 |
111 | 7 |
111 | 7 |
Result: 11111111 in binary = 377 in octal.
Binary to Octal table
Binary to other systems
Other systems to octal
Reverse conversion
Frequently asked questions
How do you convert binary to octal?
Split the binary number into groups of 3 digits starting from the right, and replace each group with its octal digit. (Or: multiply each digit by 2 raised to the power of its position (counting from 0 on the right) and add the results, then divide the number by 8 again and again and write down the remainders; read in reverse order, the remainders are the octal digits.)
What is 11111111 in octal?
11111111 in binary is 377 in octal.