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Unit Conversion Calculators

Octal to Binary Calculator

Convert a base-8 (octal) number to base-2 binary notation.

Enter an octal number using only digits 0-7.
Binary —
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About the Octal to Binary Calculator

Octal (base-8) and binary (base-2) are closely related since 8 is a power of 2 — each octal digit maps to exactly three binary digits. This converter first turns the octal number into decimal, then into binary.

Formula: Convert Octal → Decimal, then repeatedly divide by 2 and record remainders to get the binary digits.

Useful for digital electronics, low-level programming and understanding file permission bit patterns.

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