644 Octal in Decimal

Let's convert the octal number 644 to decimal without using a calculator:

Step 1: Write Down Powers of 8

Write down the powers of 8 starting from the right, with the first digit corresponding to 80, the second to 81, the third to 82, and so on.

828180
6481
684848
Step 2: Convert Each Octal Digit to Decimal

Convert each octal digit to its decimal equivalent:

68 = 610

48 = 410

48 = 410

Step 3: Multiply and Sum

Multiply each octal digit by its corresponding power of 8 and sum the results.

(6 × 64) + (4 × 8) + (4 × 1) = 384 + 32 + 4 = 420

So, the decimal representation of the octal number 644 is 420.
Octal To Decimal Converter



Other examples of Octal to Decimal conversion
See also: