What does this tool do?
| Direct answer | Converts an octal (base-8) integer to its decimal value. |
| Key fact | Octal digits are 0-7; one octal digit is exactly 3 bits. |
| Processing | Runs locally in your browser; no data is sent to a server. |
How to use
- Type an octal number like 17.
- Click Convert.
- See the decimal value.
Example
Input
17
Output
15
Who is this for?
This tool was built for people who need a fast answer in the browser — no install, no account, no data leaving the device.
Programmers working with low-level data, computer science students, and electronics hobbyists reading registers — anyone tired of converting number bases by hand.
Frequently asked questions
What is 17 octal in decimal?
15 — 1×8 + 7.
Where is octal used today?
Mainly in Unix file permissions (chmod 755).
Is 8 a valid octal digit?
No — digits 8 and 9 make the input invalid.