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Chmod Permissions Calculator

Calculate Unix file permissions, convert between octal (755, 644) and symbolic notation (-rwxr-xr-x), generate shell commands, and compute umask values.

Quick Answer & Summary

Toggle Read (4), Write (2), and Execute (1) permissions for Owner, Group, and Others to calculate octal numbers (e.g. 755, 644) and symbolic notation (-rwxr-xr-x) with ready-to-copy chmod commands and standard presets.

Unix Octal Permission Values
Permission Value = Read (4) + Write (2) + Execute (1)

7 = Read, Write & Execute (4+2+1); 6 = Read & Write (4+2); 5 = Read & Execute (4+1); 4 = Read only (4); 0 = No permissions.

Unix Permissions Grid

Toggle checkboxes or enter octal/symbolic notation directly

755
-rwxr-xr-x
Owner (User)7
Group5
Others (Public)5
Special Attributes (Optional)
Standard Unix Presets:

Ready-to-Copy Shell Commands

chmod 755 /var/www/html
chmod -R 755 /var/www/html
chmod u=rwx,g=rx,o=rx /var/www/html

Umask Permission Calculator

New File Permission (Base 666)
644-rw-r--r--
New Directory Permission (Base 777)
755drwxr-xr-x

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Toolbox Editorial TeamVerified Authors

Systems & Security Engineers • Applied Cryptography & High-Performance Web Tools

Updated:
100% In-BrowserZero server storage
Standards AuditedRFC & ISO compliant
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Documentation & Guide

How to Use Chmod Permissions Calculator

1

Toggle Permission Checkboxes

Check Read (4), Write (2), or Execute (1) boxes for Owner (User), Group, and Others (Public).

2

Direct Octal / Symbolic Input

Type an octal number (e.g. 755, 644, 4755) or symbolic string (-rwxr-xr-x) for instant bidirectional synchronization.

3

Choose Standard Presets

Click presets like Standard Web Files (644), Web Directories (755), SSH Keys (600), or Shared Temp (1777).

4

Copy Terminal Commands

Enter your target file or directory path and copy ready-to-run chmod, recursive chmod -R, or symbolic commands.

Pro Tips
Use the Standard Presets for instant 1-click web, SSH, and executable file setups
Enter your target server path to copy complete CLI commands directly into terminal

Practical Examples & Conversions

Input
Octal: 755
Output
Symbolic: -rwxr-xr-x (Owner: Read/Write/Exec, Group: Read/Exec, Others: Read/Exec)

Frequently Asked Questions (PAA)

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Authoritative Standards & Citations

Calculations and algorithms on this page are implemented and verified in strict accordance with the following official technical specifications:

IETF (Internet Engineering Task Force)

RFC 7519: JSON Web Token (JWT)

Standardized compact, URL-safe means of representing claims to be transferred between two parties.

W3C Recommendation

Web Cryptography API Specification

Standard JavaScript API for performing basic cryptographic operations in web applications.

IETF Standards Track

RFC 4122: A Universally Unique IDentifier (UUID) URN Namespace

Definition of uniform format and generation algorithms for UUIDs.