Developer

chmod Calculator

Linux file permission calculator — rwx ↔ octal

Owner

rRead +4wWrite +2eExecute +1

Group

rRead +4wWrite +2eExecute +1

Other

rRead +4wWrite +2eExecute +1

Octal

chmod 644

Symbolic

rw-r--r--

About chmod Calculator

The chmod Calculator converts between Linux file permission formats, translating between symbolic notation like rwxr-xr-x and octal numbers like 755. It runs in your browser, is free, and stores no data. Essential for Linux users and system administrators managing file permissions.

Frequently Asked Questions

How do I calculate file permissions?

Toggle the read, write, and execute checkboxes for owner, group, and others, and the tool will instantly show the corresponding octal number. You can also enter an octal value to see the symbolic permission breakdown.

Is any data stored when using the calculator?

No, the calculator runs entirely in your browser. No permission values or settings are sent to any server. It is a simple local calculation tool with no data transmission whatsoever.

What do the permission numbers mean?

Each digit in the octal number represents permissions for owner, group, and others respectively. The values are 4 for read, 2 for write, and 1 for execute, added together. So 755 means the owner has full access (7=4+2+1), while group and others can read and execute (5=4+1).