Chmod Calculator

Calculate Unix/Linux file permissions. Convert between numeric and symbolic notation.

Numeric (Octal)
755
chmod 755 filename
Symbolic
rwxr-xr-x
-rwxr-xr-x
Permission Matrix
Read (4)
Write (2)
Execute (1)
Owner
Group
Others
Enter Numeric Value
Enter 3 or 4 digit octal number (e.g., 755, 0644)
Enter Symbolic Value
Enter 9 characters (e.g., rwxr-xr-x)
Common Permissions
Permission Reference
Permission Values
r (read)4
w (write)2
x (execute)1
- (none)0
Permission Groups
  • Owner: File owner
  • Group: Group members
  • Others: Everyone else
Common Use Cases
  • 755 - Scripts, executables
  • 644 - Regular files
  • 600 - Private configs
  • 700 - Private directories