Decimal ↔ Octal Converter
Free online Decimal ↔ Octal Converter tool.
Mathstable
Input
Enter values for Decimal/Octal Converter
Direction
Value
Result
Run calculation to see results
About Decimal ↔ Octal Converter
Convert base-10 (decimal) numbers into base-8 (octal) strings, and vice versa. Commonly used when configuring Unix/Linux file permissions (chmod).
How to Use
1
Choose between Decimal to Octal, or Octal to Decimal.
2
Enter your numerical value.
3
The translated value updates instantly.
Real-World Examples
Decoding Unix File Permissions
Translate the decimal equivalent of a file permission back into standard octal format.
Input
493 (Decimal)
Output
755 (Octal)
Best Practices
- Octal numbers only use digits 0 through 7. Entering an 8 or 9 will result in an invalid input error.
Pro Tips
In many programming languages, prefixing a number with `0` or `0o` denotes an octal literal.
Frequently Asked Questions
Is this tool free?
Yes, all tools on ToolMono are 100% free.
Is my data secure?
Absolutely. All processing is done locally in your browser.
Security & Privacy
All conversions run securely offline inside your browser.