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Octal Converter — Octal, Decimal & Binary

Convert octal numbers to decimal, binary and hex

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Features

  • All bases
  • Validation
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This tool runs on your device — your files and inputs never go anywhere.

How to Use Octal Converter

Convert octal numbers to decimal, binary and hex No signup, and nothing gets uploaded for most use.

  1. 1

    Enter your numbers in the input fields.

  2. 2

    Choose the calculation options or frequency.

  3. 3

    The result updates instantly as you type.

  4. 4

    Review the breakdown, chart, or schedule, and copy the answer.

Why you might like it

  • Nothing to upload — the work happens on your device.
  • Free with no signup, no watermarks, and no daily limits.
  • Works in any modern browser on any device — nothing to install.
  • Usually done in a few seconds, so it doesn't get in your way.
Try Octal

Frequently Asked Questions

How do you read an octal number?▾

Every octal digit is a power of eight, starting at 8⁰ for the rightmost digit. 17₈ is 1×8 + 7×1 = 15 in decimal.

Why does octal use only digits 0 to 7?▾

Base 8 needs exactly eight symbols. One octal digit maps to exactly three binary bits, which made octal popular for early computers with word sizes divisible by three.

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