Binary to Octal Converter
Convert binary (base-2) numbers to octal (base-8).
Try an example:
- Binary (2)
11111111- Octal (8)
377- Decimal (10)
255- Hexadecimal (16)
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Converting Binary to Octal
Because 8 equals 2 to the 3rd power, each octal digit maps to exactly three binary bits, so this conversion is a simple regrouping.
How to convert Binary to Octal by hand
- Split the binary number into groups of three bits, starting from the right.
- Pad the leftmost group with leading zeros if needed.
- Convert each 3-bit group to its octal digit (000 = 0 … 111 = 7).
Worked example
11111111 (binary) → 377 (octal) — 011 111 111 → 3 7 7.
More converters
- Decimal to Binary
- Binary to Decimal
- Decimal to Hexadecimal
- Hexadecimal to Decimal
- Binary to Hexadecimal
- Hexadecimal to Binary
Frequently asked questions
How do I convert Binary to Octal?
Split the binary number into groups of three bits, starting from the right. Pad the leftmost group with leading zeros if needed. Convert each 3-bit group to its octal digit (000 = 0 … 111 = 7). Or just use the converter on this page — it does it instantly. Example: 11111111 (binary) becomes 377 (octal).
What is 11111111 (binary) in octal?
11111111 (binary) converts to 377 (octal). 011 111 111 → 3 7 7.
Is this converter free and private?
Yes — it is free and unlimited, and the conversion runs entirely in your browser, so nothing is uploaded to a server.