Octal to Decimal Converter

Enter value and click on calculate. Result will be displayed.
Enter Octal Number :
Result:
Decimal :

What is an Octal to Decimal Converter?

An Octal to Decimal Converter is a tool that converts a number from octal (base 8) to decimal (base 10). It is useful in computing, digital electronics, and programming.

Why Use an Octal to Decimal Converter?

  • To interpret octal values in computer memory addresses and file permissions.
  • To convert legacy system numbers (older computers used octal-based processing).
  • To understand digital logic in microcontrollers and embedded systems.

How to Convert Octal to Decimal?

The formula for conversion:

Where dn​ are the digits of the octal number.

Example: Convert 753₈ to decimal:

When to Use It?

  • In computer science (e.g., Unix file permissions: 755 in octal).
  • In electronics (e.g., microprocessor programming).
  • In historical computing (e.g., older systems that used octal instead of binary).