Octal to Decimal converter

How to convert Octal to Decimal:

A regular decimal number is the sum of the digits multiplied with 10ⁿ.

Example:

137 in base 10 is equal to each digit multiplied with its corresponding 10ⁿ:

137₁₀ = (1 * 10²) + (3 * 10¹) + (7 * 10⁰)

= 100 + 30 + 7

Octal numbers are read the same way; however each digit counts 8ⁿ instead of 10ⁿ.

Multiply each digit of the hex number with its corresponding 8ⁿ.