Binary to Octal Converter
Convert any binary number to octal instantly — see how the bits group into threes. Free, fast, no sign-up.
Only 0s and 1s allowed — spaces, commas and dashes are ignored.
Octal result
Also equals
- Binary
- Decimal
- Octal
- Hex
Step-by-step calculation
| 3-bit group | Octal digit |
|---|
How to convert binary to octal
- Split the binary number into groups of 3 bits, starting from the right (pad the left with zeros if needed).
- Convert each 3-bit group to its octal digit (000=0 … 111=7).
- Read the digits left to right — that's your octal number.
Example: 101101₂ → 101 101 → 5 5 → 55₈.
Frequently asked questions
How do I convert binary to octal?
Group the bits in threes from the right, convert each group to an octal digit, and read the digits left to right.
What is 1010 in octal?
1010₂ = 12₈.
Why group in threes?
Because 2³ = 8 — each group of 3 bits maps exactly to one octal digit.
Need the reverse? Try our octal to binary converter.