What does this tool do?
| Direct answer | Converts a decimal integer to octal (base-8). |
| Key fact | Successive division by 8 with recorded remainders produces the octal digits. |
| Processing | Runs locally in your browser; no data is sent to a server. |
How to use
- Type a decimal number like 15.
- Click Convert.
- See the octal value.
Example
Input
15
Output
17
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 15 in octal?
17.
Why does JS show 0o17?
Modern JS uses the 0o prefix for octal literals.
Negative numbers?
Supported — the sign is preserved.