Binary to Octal
Convert binary numbers to octal instantly. For example, 101010 in binary is 52 in octal.
Binary to Octal — quick reference
| Binary | Octal |
|---|
How to use the Binary to Octal
- Type or paste your binary value on the left.
- Read the octal result on the right — separate multiple values with spaces.
- Copy the result, or check the reference table below.
About the Binary to Octal
This tool converts binary numbers to octal. Binary is base 2, written with the digits 0 and 1; octal is base 8, written with 0 through 7. Type a value on the left and the octal result appears instantly, and you can convert several values at once by separating them with spaces.
Worked example. Go through decimal as a bridge: 101010 in binary is 42 in decimal, and 42 in decimal is 52 in octal. This tool does both steps at once.
Grouping bits into threes is exactly why octal caught on: a Unix permission set collapses into the tidy 755 you type after chmod, three bits to each digit with nothing left over. The conversion rewrites the value without altering it — a whole number in base 2 and the same number in base 8 differ only in how they are written, never in size, so there is nothing to round. A handful more binary-to-octal pairs sit in the reference table below if you want to check a few by eye, and the whole calculation happens locally in your browser, so nothing you enter ever leaves your machine. For the reverse direction use the octal to Binary converter, or the all-in-one number base converter for arbitrary bases.
Frequently asked questions
What is 101010 in binary converted to octal?
101010 in binary equals 52 in octal. You can confirm it with the worked example above, or by typing 101010 into the converter.
Is this binary to octal conversion exact?
Yes. Converting a whole number between bases changes only how it is written, not its value, so there is no rounding. 101010 and 52 are the same quantity expressed in base 2 and base 8.
Can I convert more than one binary value at once?
Yes. Separate each binary value with a space and every one is converted to octal on its own, in order.
Is my data uploaded anywhere?
No. The conversion runs entirely in your browser with JavaScript; nothing you type is sent to a server.