Enter an octal number (base 8, digits 0–7) to see its decimal, binary, and hexadecimal equivalents. Useful for Unix file permissions and legacy systems.
INPUT BASE
All bases shown simultaneously.
Conversion uses JavaScript's built-in parseInt(value, fromBase).toString(toBase). All four bases are computed simultaneously from the same input value, so you can see binary, octal, decimal, and hex at a glance.
All conversion runs in your browser tab. Our servers are not involved at any point.
For converting between data sizes like KB and MB, try the byte converter. To compute MD5 or SHA hashes from values, use the hash generator. For working with file permission bits, see the chmod calculator.