How do octal digits work?

Each digit sums read (4), write (2), and execute (1) for owner, group, and other respectively.

Can I type symbolic notation directly?

Yes, type a 9-character string like rwxr-xr-x and it syncs to the grid and octal value.

Does this apply the permission to a real file?

No, it only calculates the values — run the generated chmod command yourself.

Chmod Calculator

Unix permission calculator: checkboxes, octal, and symbolic.

Works Offline

Privacy First

No Login

No API

Result

Octal, symbolic, and chmod command

Octal

755

Symbolic

rwxr-xr-x

Command

chmod 755 <file>

Set by octal

Set by symbolic

r = 4, w = 2, x = 1 — add the values per role to get the octal digit.

About the Chmod Calculator

Calculate Unix file permissions interactively — toggle read/write/execute checkboxes per owner, group, and other, and see the equivalent octal digits, symbolic notation, and chmod command, all kept in sync.

Examples

755 permissions

rwxr-xr-x

Output

chmod 755 <file>

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser