🔑 Linux Chmod Permissions Calculator
Calculate Linux/Unix file permissions with interactive read, write, and execute checkboxes. Generates octal (755, 644) and symbolic permissions.
Free No Signup Required Browser-Based
👤 Owner (User)
👥 Group
🌍 Public (Others)
Octal Permission Code
755
Symbolic: -rwxr-xr-x
$ chmod 755 filename.ext
How to Use Linux Chmod Permissions Calculator
- Click a preset (755, 644, 777, 600) or check individual r/w/x boxes for Owner, Group, and Others
- View the resulting 3-digit octal number and symbolic string
- Copy the ready-to-run `chmod` terminal command
📖 Technical Encyclopedia & Standards Reference
Calculate Linux/Unix file permissions with interactive read, write, and execute checkboxes. Generates octal (755, 644) and symbolic permissions. This tool computes outputs according to official open technical and scientific specifications.
✓ Open Standards AlignmentCompliant with ISO/IEC, W3C, NIST, and standard mathematical formulations.
✓ 100% Client-Side / SecureZero server logging. Computations execute entirely in your local browser sandbox.
Explore more formulas in our Tools Encyclopedia & Glossary →
Frequently Asked Questions
How are Linux chmod octal values calculated?
Read = 4, Write = 2, Execute = 1. The sum of selected permissions determines the digit for Owner, Group, and Others (e.g. 4+2+1 = 7).
What is the difference between 755 and 644 permissions?
755 gives the owner full access (rwx) while group/others can read and execute (scripts/folders). 644 allows owner read/write and others read-only (standard files).