Octal to Binary Converter
Convert octal (base-8) numbers to binary (base-2).
Try an example:
- Binary (2)
11111111- Octal (8)
377- Decimal (10)
255- Hexadecimal (16)
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Converting Octal to Binary
Each octal digit expands to exactly three binary bits, so converting is a quick per-digit lookup.
How to convert Octal to Binary by hand
- Replace each octal digit with its 3-bit binary equivalent (0 = 000 … 7 = 111).
- Concatenate the groups in order.
- Optionally drop any leading zeros.
Worked example
377 (octal) → 11111111 (binary) — 3 = 011, 7 = 111, 7 = 111.
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 Octal to Binary?
Replace each octal digit with its 3-bit binary equivalent (0 = 000 … 7 = 111). Concatenate the groups in order. Optionally drop any leading zeros. Or just use the converter on this page — it does it instantly. Example: 377 (octal) becomes 11111111 (binary).
What is 377 (octal) in binary?
377 (octal) converts to 11111111 (binary). 3 = 011, 7 = 111, 7 = 111.
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.