Online Tool Store
Octal to Decimal
Enter an octal number and get its decimal (base-10) equivalent instantly. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Decimal
Example shown — replace it with your own octal number.
How it works
- Enter an octal (base-8) number.
- The value is parsed and converted to base-10.
- Read the decimal result instantly.
Conversion uses parseInt(value, 8) to interpret the
digits as base-8, then displays the resulting number in ordinary
base-10 — the standard number-base conversion used across
programming and digital electronics.
FAQ
Is my data uploaded anywhere?
No. Conversion happens entirely in your browser — nothing is sent to a server.
Can I convert more than one number at a time?
Yes — paste multiple octal numbers separated by spaces, commas, or newlines and each converts independently.
What digits are valid in octal?
Only 0 through 7 — any other digit is flagged as invalid for that number.
Can I go from decimal back to octal?
Yes — see the companion Decimal to Octal tool for the reverse conversion.
How we compare
| Feature | Online Tool Store | Scientific calculator | Python one-liner |
|---|---|---|---|
| No mode-switching needed | ✓ | Requires switching base modes | ✓ |
| Free, no setup | ✓ | ✓ | Requires Python installed |
A scientific calculator works but needs switching into octal mode first. Octal to Decimal converts instantly with no mode-switching.