Example
chmod 754 → rwxr-xr--
Chmod Calculator
Convert Unix file permission symbols (rwx) to numeric chmod values and back instantly. Free online chmod calculator with symbolic notation explained.
Enter the values below, then press Calculate (or press Enter). The calculator updates your results instantly. Try different values to see how your inputs change the outcome.
- Owner (u) — enter a text value. A typical Owner (u) would be rwx.
- Group (g) — enter a text value. A typical Group (g) would be r-x.
- Others (o) — enter a text value. A typical Others (o) would be r--.
- Review your results — the key output is highlighted, with supporting figures below.
Loading calculator…
Results
Numeric value
| Detail | Value |
|---|---|
| Command | |
| Owner | |
| Group | |
| Others | |
| Decimal (octal as number) |
What is this calculator for?
Convert between symbolic Unix permissions (rwx) and their numeric octal form, and read off the exact chmod command to use.
How to Use This Calculator
Enter the values below, then press Calculate (or press Enter). The calculator updates your results instantly. Try different values to see how your inputs change the outcome.
- Owner (u) — enter a text value. A typical Owner (u) would be rwx.
- Group (g) — enter a text value. A typical Group (g) would be r-x.
- Others (o) — enter a text value. A typical Others (o) would be r--.
- Review your results — the key output is highlighted, with supporting figures below.
What You'll Need
- Owner (u)
- a text value · required
- Group (g)
- a text value · required
- Others (o)
- a text value · required
About This Calculator
This chmod calculator converts symbolic Unix permission strings like rwx, r-x, and r-- into their numeric octal value and back.
Each permission maps to a number: read (r) = 4, write (w) = 2, execute (x) = 1. A class’s value is the sum (e.g. rwx = 7, r-x = 5, r-- = 4). The three classes — owner (u), group (g), others (o) — combine into the familiar three-digit chmod like 755.
The result is shown as both the numeric value and the exact chmod command you can run, plus the symbol form of each class so you always know what the permission allows.
Worked Examples
Frequently Asked Questions
What does chmod 755 mean?
Owner has full rwx (7), group has r-x (5), others have r-x (5). It is the common permission for web files and publicly readable executables.
How do I read permissions like rwxr-xr--?
Read left to right in three groups of three: owner (rwx), then group (r-x), then others (r--). The letter - means that permission is off.