Chmod Calculator
Calculate Unix file permissions interactively. Toggle checkboxes or enter a numeric value to convert between formats.
or use the checkboxes below
| Entity | Read | Write | Execute | Octal | Symbolic |
|---|---|---|---|---|---|
| User (Owner) | 7 | rwx | |||
| Group | 5 | r-x | |||
| Others | 5 | r-x |
Numeric
755Symbolic
rwxr-xr-xCommand
chmod 755 filels -l output preview
-rwxr-xr-x 1 user group 4096 Apr 2 12:00 filenameCommon Permissions
About Chmod Calculator
This free online chmod calculator helps you compute Unix/Linux file permissions. Toggle read, write, and execute permissions for user, group, and others to see the numeric (octal) and symbolic notation instantly.
Understanding Unix Permissions
Every file and directory in Unix/Linux has three permission sets: one for the owner (user), one for the group, and one for everyone else (others). Each set can have read (r=4), write (w=2), and execute (x=1) permissions.
Numeric vs. Symbolic Notation
- Numeric (octal): Three digits (e.g., 755), each the sum of read (4) + write (2) + execute (1)
- Symbolic: Nine characters (e.g., rwxr-xr-x) showing permissions for user, group, and others
Common Permission Values
755— Standard for executables and directories644— Standard for regular files700— Private directories (owner only)600— Private files like SSH keys