Chmod-Calculator.app
Easily calculate and convert chmod permissions between Numeric (e.g. 777), Symbolic (e.g. +x), and RWX notations (e.g. rw-r--r--).
Chmod Calculator
Simple Chmod Calculator with intuitive checkbox on user, group and others
Check any permission box or input any Chmod options to get instant calculation results !
User (Owner) Permissions
Group Permissions
Others (Public) Permissions
Chmod Permissions Calculation Table
| r w x | |||
|---|---|---|---|
| 4 2 1 | |||
| Decimal | Calculation | Symbolic | Description |
| 0 | 0 + 0 + 0 | - - - | none |
| 1 | 0 + 0 + 1 | - - x | execute only |
| 2 | 0 + 2 + 0 | - w - | write only |
| 3 | 0 + 2 + 1 | - w x | write and execute |
| 4 | 4 + 0 + 0 | r - - | read only |
| 5 | 4 + 0 + 1 | r - x | read and execute |
| 6 | 4 + 2 + 0 | r w - | read and write |
| 7 | 4 + 2 + 1 | r w x | read, write, and execute |
Common Chmod Options
Understanding chmod 755
chmod 755 allows the owner to read, write, and execute the file, while group members and others can read and execute but not modify it. This is commonly used for directories or scripts that need to be executable by everyone but should only be modifiable by the owner. It's a standard permission set for public directories in web servers.