About

Chmod Calculator

Calculate Linux file permissions from symbolic or numeric notation

Owner7
Group5
Others5

Octal

755

Symbolic

rwxr-xr-x

Command

chmod 755 filename

Common Permissions

About This Tool

Chmod Calculator is a free online tool that helps you calculate Linux and Unix file permissions. File permissions in Linux are represented by a three-digit octal number (such as 755 or 644) or symbolic notation (such as rwxr-xr-x). Each digit represents permissions for the owner, group, and others. This tool lets you toggle read (r), write (w), and execute (x) permissions for each category and instantly see the corresponding octal code, symbolic notation, and the chmod command. Understanding file permissions is critical for Linux system administration, web server configuration, and securing sensitive files and directories. Whether you are setting up a new server, configuring Apache or Nginx, or managing deployment scripts, this calculator ensures you apply the correct permissions every time. All processing happens in your browser — no data is sent to any server.

How to Use

  1. Toggle the Read, Write, and Execute checkboxes for Owner, Group, and Others.
  2. The octal code (e.g., 755) and symbolic notation (e.g., rwxr-xr-x) update automatically.
  3. Copy the chmod command from the output area.
  4. You can also type an octal code directly to see the permission breakdown.
  5. Use 'Reset' to restore default permissions (755).

Frequently Asked Questions

chmod 755 means: Owner can read, write, execute (rwx=7), Group can read and execute (r-x=5), Others can read and execute (r-x=5). This is the most common permission for directories and executable files.
chmod 644 means: Owner can read and write (rw-=6), Group can read (r--=4), Others can read (r--=4). This is the standard permission for regular files.
755 includes execute permission for everyone (used for directories and scripts), while 644 removes execute permission (used for regular files like documents and images).
Yes. All processing happens entirely in your browser using client-side JavaScript. No data is sent to any server, stored anywhere, or shared with third parties. Your permission calculations remain completely private at all times.
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