Octal to Decimal Converter

Summary

Enter an octal number and instantly see its decimal equivalent with a step-by-step conversion breakdown.

How it works

1. Type one or more octal numbers (digits 0-7 only) into the input field.
2. For batch conversion, enter each number on a separate line.
3. Click "Convert" or press Enter to see the decimal result.
4. The step-by-step panel shows exactly how each digit contributes to the final value.
5. Use the "Copy Result" button to copy the decimal output to your clipboard.

Use cases

• Convert Unix/Linux file permission octals (e.g. 755, 644) to their decimal equivalents.
• Decode octal escape sequences found in C, Python, and other programming languages.
• Verify octal literals in embedded systems and low-level code.
• Learn positional notation by seeing how each octal digit maps to a power of 8.
• Batch-convert a list of octal numbers from log files or data exports.
• Cross-check manual calculations when working with legacy systems.

Frequently Asked Questions