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The Excel HEX2OCT Function
Related Function:
Oct2Hex FunctionBasic 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 Hex2Oct function converts a Hexadecimal (Base 16) number into an Octal (Base 8) number.
The format of the function is :
HEX2OCT( number, [places] )
Where the function arguments are :
number    The hexadecimal number that is to be converted to octal. 
[places]    An optional argument, which specifies the number of characters that you want the returned octal number to have. If this is greater than the minimum, the octal number will be padded out using leading zeros. If omitted, the returned octal uses the minimum number of places. 
Note that the number argument must be no 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.
It should also be noted that, as hexadecimals use the numbers 09 and the characters af, they should be enclosed in quotation marks when they are supplied to an Excel function. (eg. The hexadecimal 11a should be input as "11a").
+ Display Hexadecimal and Octal Summary:
Hexadecimal
The Hexadecimal (Base 16) Numeral System uses the digits 09 and the characters af.
The following table shows the first 32 hexadecimal values, along with the equivalent decimal values:
Hexadecimal  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f  10  11  12  13  14  15  16  17  18  19  1a  1b  1c  1d  1e  1f  20 
Decimal  1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32 
For further information on the hexadecimal numeral system, see the Wikipedia Hexadecimal Page
Octal
The Octal (Base 8) Numeral System uses the digits 07.
The following table shows the first 16 octal values, along with the equivalent decimal values:
Octal  1  2  3  4  5  6  7  10  11  12  13  14  15  16  17  20 
Decimal  1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16 
For further information on the octal numeral system, see the
Wikipedia Octal PageExcel Hex2Oct Function Examples
The following spreadsheet shows examples of the Excel Hex2Oct function. The format of the function is shown in the spreadsheet on the left and the result is shown in the spreadsheet on the right.
Formulas:  A 

1  =HEX2OCT( "A" ) 

2  =HEX2OCT( "000000000F" ) 

3  =HEX2OCT( "8", 10 ) 

4  =HEX2OCT( "FFFFFFFFF8" ) 

5  =HEX2OCT( "1F3" ) 

 Results:  A 

1  12 

2  17 

3  0000000010 

4  7777777770 

5  763 


Note that, in the above example spreadsheet, the negative hexadecimal and octal numbers in cell A4 are represented by two's complement notation.
Further information and examples of the Excel Hex2Oct function can be found on the Microsoft Office website.
Hex2Oct Function Common Errors
If you get an error from your Excel Hex2Oct function this is likely to be one of the following :
Common Errors
#VALUE!    Occurs if the supplied [places] argument is not recognised as a number 
#NUM!    Occurs if either:  the supplied number argument is not recognised as a hexadecimal number or contains more than 10 characters
 the resulting octal number requires more places than is specified by the supplied [places] argument
 the supplied [places] argument ≤ 0

#NAME?    Occurs when Analysis ToolPak addin is not enabled in your Excel. You will need to enable the addin if you want to use the Excel engineering functions.
+ Show How to Do This in Excel 2003:
 From the Tools dropdown menu, select the option AddIns ...
 An 'AddIns' window will pop up. From this, select the option Analysis ToolPak and click OK
+ Show How to Do This in Excel 2007:
 Click the Microsoft button on the top left of your spreadsheet and select
the Excel Options button
 From the menu on the left hand side, select AddIns
 In the 'Manage:' box, select Excel Addins and click Go...
 An 'AddIns' window will pop up. From this, select the option Analysis ToolPak and click OK
+ Show How to Do This in Excel 2010 or Excel 2013:
 Click the File tab (top left of your spreadsheet) and select Options
 From the menu on the left hand side, select AddIns
 If the window that pops up doesn't show the 'Addins' list, use the 'Manage:'
dropdown menu (at the bottom of the window) to select Excel Addins. Click Go...
 From the 'AddIns' window, select the option Analysis ToolPak and click OK
