Calculator
What the Chmod Calculator does
Chmod Calculator: calculates Octal, Symbolic and Command from Convert from, Octal mode and Symbolic mode. Example: convert from Octal (e.g. 755), octal mode 755 and symbolic mode rwxr-xr-x gives octal 755.
Supply Convert from, Octal mode, Symbolic mode and File or directory name and you get Octal, Symbolic and Command back. The result recalculates on every keystroke without a button press or a page reload.
It is mostly used by developers debugging a payload. Spotting a malformed field is far quicker when the structure is laid out clearly.
The parsing happens in your browser, so sensitive payloads never leave your machine.
The rest of this page documents each field, the method, and a worked example built from the values the chmod calculator loads by default.
What do the Chmod Calculator fields mean?
The Chmod Calculator uses 4 inputs. The defaults are there to be replaced. They exist so the tool is never showing an empty result.
| Field | What to enter | Default |
|---|---|---|
| Convert from | choose from Octal (e.g. 755) or Symbolic (e.g. rwxr-xr-x) | Octal (e.g. 755) |
| Octal mode | required | 755 |
| Symbolic mode | required | rwxr-xr-x |
| File or directory name | optional | script.sh |
How does the Chmod Calculator work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same calculation.
The tool refuses to guess: if a value is missing or impossible, it says so.
Worked example
These are the values the Chmod Calculator loads by default, and the result it produces from them. These are the tool’s own default values and the result they produce, not an invented illustration.
| Convert from | Octal (e.g. 755) |
|---|---|
| Octal mode | 755 |
| Symbolic mode | rwxr-xr-x |
| File or directory name | script.sh |
| Octal | 755 |
|---|---|
| Symbolic | rwxr-xr-x |
| Command | chmod 755 script.sh |
| Breakdown | Owner 7 read, write, execute Group 5 read, execute Others 5 read, execute |
| What it means | World-readable and executable/traversable. |
How to use it
- Pick a value for Convert from: the options are Octal (e.g. 755) or Symbolic (e.g. rwxr-xr-x).
- Key in Octal mode.
- Fill in Symbolic mode.
- Type File or directory name.
- The output refreshes live, so you can stop as soon as the number looks right.
- The results panel then shows Octal, Symbolic, Command, Breakdown and What it means.
- Both Copy Link and Print capture the current state, so pick whichever suits how you file things.
What this tool does not do
- Output follows the common convention for this format; a specific toolchain may have its own house style.
- Processing happens in your browser, so very large inputs are bounded by available memory.
- Defaults are illustrative starting points, not recommendations.
Frequently asked questions
Convert from, Octal mode, Symbolic mode and File or directory name, nothing else. A starting value is in place for each, meaning you can explore the calculation before committing to real figures.
With the values loaded when the page opens, octal comes out as 755. It recalculates the moment an input changes, which makes comparing scenarios quick.
Nothing is logged. The tool is client-side code; your data stays where you entered it.
It costs nothing, and there is no limit on repeat use.
The logic is straightforward and testable; the worked example above uses the tool’s own defaults so you can verify it yourself.