The Excel OCT2DEC Function

Related Function:
Dec2Oct Function

Basic Description

Hexadecimal (base 16), decimal (base 10), octal (base 8), and binary (base 2) are the most commonly used numeral systems in engineering and computing. Therefore, Excel has provided functions to convert numeric values to and from each of these systems.

The Excel Oct2Dec function converts an Octal (a base-8 number) into a decimal number.

The format of the function is :

OCT2DEC( number )

Where the number argument is the octal number that is to be converted to decimal.

Note that the supplied number argument must not be more than 10 characters (40 bits) long. The most significant bit of this value denotes the sign of the number and the remaining 39 bits denote the magnitude. Negative numbers are represented using two's complement notation.

Oct2Dec Function Examples

The following spreadsheet shows examples of the Excel Oct2Dec function.

Formulas:
A
1=OCT2DEC( "10" )
2=OCT2DEC( "22" )
3=OCT2DEC( "0000000010" )
4=OCT2DEC( "7777777770" )
5=OCT2DEC( "355" )
Results:
AB
18  Result is   1*8 + 0
218  Result is   2*8 + 2
38  Result is   1*8 + 0
4-8  Result is   -8^9 + 7*8^8 + 7*8^7 + ... + 7*8 + 0
5237  Result is   3*8^2 + 5*8 + 5

Note that, in the above example spreadsheet, the negative octal in cell A4 is represented by two's complement notation.

Further information and examples of the Excel Oct2Dec function can be found on the Microsoft Office website.

Oct2Dec Function Errors

If you get an error from your Excel Oct2Dec function this is likely to be one of the following :

Common Errors
 #NUM! - Occurs if the supplied Number argument is not recognised as a octal number, or contains more than 10 characters #NAME? - Occurs when Analysis ToolPak add-in is not enabled in your Excel.You will need to enable the add-in if you want to use the Excel engineering functions.