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Unit Conversion Calculators

Octal to Decimal Calculator

Convert a base-8 (octal) number to base-10 decimal notation.

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

Octal (base-8) uses digits 0 through 7, with each position representing a power of 8. It was historically popular in computing as a compact stand-in for binary values.

Formula: Decimal = ∑ (digit × 8position)

For example, octal 17 equals decimal 15 (1×8 + 7×1). Useful for computer science coursework and interpreting Unix file permission codes.

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