Calculate Unix file permissions with an interactive checkbox matrix. Convert between octal and symbolic notation.
Last updated: February 23, 2026
Toggle permissions or type an octal mode to convert.
| Role | Read | Write | Execute | Octal |
|---|---|---|---|---|
| Owner | 7 | |||
| Group | 5 | |||
| Others | 5 |
Octal Notation
755
chmod 755 file
Symbolic Notation
-rwxr-xr-x
ls -l output
This tool helps you calculate Unix/Linux file permission values. Special bits (setuid, setgid, sticky) are prepended as a fourth digit when active.
Calculate Unix file permissions with an interactive checkbox matrix. Convert between octal and symbolic notation. This tool runs in-browser for fast results without account setup.
Yes. Chmod Calculator is free to use on ConvertCrunch.
Results depend on the inputs and assumptions you provide. Always validate final numbers or outputs against your official workflow before publishing or filing.
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