Octal to Decimal Converter
Enter an octal number and instantly see its decimal equivalent with a step-by-step conversion breakdown.
Octal Input
Quick examples:
Enter an octal number on the left and click Convert.
Step-by-step breakdown
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Summary
Enter an octal number and instantly see its decimal equivalent with a step-by-step conversion breakdown.
How it works
- Type one or more octal numbers (digits 0-7 only) into the input field.
- For batch conversion, enter each number on a separate line.
- Click "Convert" or press Enter to see the decimal result.
- The step-by-step panel shows exactly how each digit contributes to the final value.
- 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
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Last updated: 2026-05-29 ·
Reviewed by Nham Vu