Binary to Octal Converter
Convert binary numbers to octal instantly, at any size. Everything runs in the browser.
About binary and octal
Binary is base 2 — every digit is a bit, 0 or 1. It is what hardware actually stores, and it surfaces anywhere bit flags, masks or permissions do. Code usually writes it with a 0b prefix.
Octal is base 8, using digits 0–7. Each octal digit maps to exactly three bits, which is why Unix file permissions like 755 are octal. Code writes it with a 0o prefix.
For example, binary 11010110 is 326 in octal. The converter uses BigInt, so numbers of any size convert without losing precision, entirely in the browser.
More number base converter pages
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