chmod Calculator

Set file permissions by clicking the checkboxes below. The octal value and chmod command update automatically.

	Read	Write	Execute	Octal
Owner				6
Group				4
Others				4

Octal 644

Symbolic rw-r--r--

chmod Command

chmod 644 filename

Or enter octal value (e.g. 755):

What is chmod?

chmod (change mode) is a Unix command used to change file and directory permissions. Permissions are split into three groups: owner, group, and others. Each group can have read (r=4), write (w=2), and execute (x=1) permissions. The octal value is the sum of these numbers for each group.

How to Use the chmod Calculator

Check or uncheck the boxes to set read, write, and execute permissions for owner, group, and others.
The octal value, symbolic notation, and chmod command update automatically.
Optionally enter a filename to see the exact command to run.
Or type an octal value (e.g. 755) and click Apply to set the checkboxes.

This free online chmod calculator works entirely in your browser — no data is sent to any server. Perfect for developers and system administrators who need to quickly calculate Unix file permissions.

Keywords: chmod calculator, unix permissions, file permissions, octal permissions, chmod 755, chmod 644, linux permissions, chmod command generator