Use our octal to decimal converter to convert a base 8 number to base 10 along with the steps and formulas used in the conversion. To convert octal to decimal, we need to multiply the octal digits with the power of 8 starting from the right-hand side and gradually decreasing to zero to sum up, all the products. Here are the steps to convert a number from octal to decimal: For example, in octal, the number 10 is equivalent to the decimal number 8, and the number 20 is equivalent to the decimal number 16. Decimal (Base-10): Decimal is the most common numeral system used worldwide. It uses 10 as its base, with digits 0-9 to represent numbers. To convert an octal number to decimal, you can use the following steps: To convert an octal number to its decimal equivalent, we multiply each digit of the octal number by its positional weight and then add all the product terms to obtain the equivalent decimal number.