Calculate chmod

Convert Unix rwx permissions between octal and symbolic form.

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ToolChmod Calculator
Input
Output
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How it works

Read, write, and execute bits map by owner, group, and other classes into octal digits; symbolic expressions add, remove, or assign those bits. The display keeps each class separate so 0754 is rwx/r-x/r--.

  • Octal is compact for shell commands.
  • Symbolic rwx form is easier to audit in documentation.

Worked example

chmod 755
The usual permissions for an executable or a directory
Input
											755
Output
												Octal: 755
Symbolic: rwxr-xr-x
Owner: read, write, execute
Group: read, execute
Other: read, execute

When to use this

Deployment scripts, package archives, and Linux permission reviews convert modes.

Edge cases

  • 0644 grants no execute bit.
  • A leading zero marks octal; treating 644 as decimal is wrong.
  • Setuid, setgid, and sticky bits use additional mode bits.

References