Chmod Calculator

Calculate Unix file permissions with an interactive chmod calculator. Convert between symbolic and numeric (octal) notation.

	Read	Write	Execute	Octal
Owner				7
Group				5
Others				5

Enter Octal

Common Permissions

Symbolic

-rwxr-xr-x

Octal

755

Command

chmod 755 filename

About Unix File Permissions

Unix and Linux systems use a permission model with three roles (owner, group, others) and three permission types (read, write, execute). Permissions can be expressed in symbolic notation (rwxr-xr-x) or numeric/octal notation (755). The chmod command changes file permissions. This calculator helps you convert between formats and understand permission values.