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Octal to Decimal Converter

Fast, accurate browser-based conversion between data representations.

About Octal to Decimal Converter Tool

Published: Last Updated:

Octal to Decimal converts base-8 numbers to base-10. Multiply each octal digit by 8 raised to its positional power and sum the results. The octal system (digits 0–7) is used in Unix permissions, some assembly languages, and older computing systems.

Key Features

  • Converts any octal number to decimal.
  • Shows positional calculation.
  • Accepts single values or lists.
  • Runs in your browser.

How to Use the Tool

  1. Enter an octal number (digits 0–7 only).
  2. Decimal result and calculation steps appear instantly.

Core Benefits

  • Needed when working with C-style octal literals (0755) in programming.

Common Use Cases

  • Octal 17 = (1×8) + (7×1) = 8 + 7 = decimal 15.
  • Converting Unix file permission 755 to decimal to compare with numeric permission systems.

Pro Tips

  • 8 in decimal is written as 10 in octal. 64 decimal = 100 octal.

Use this free Octal to Decimal Converter on GoodToolIt — instant, private, and works in any browser with no sign-up required.

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