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The Excel OCT2BIN Function
Related Function:
Bin2Oct 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 Oct2Bin function converts an Octal (Base 8) number into a Binary (Base 2) number.
The format of the function is :
OCT2BIN( number, [places] )
Where the function arguments are as follows:
number    The octal number that is to be converted to binary. 
[places]    An optional argument, which specifies the number of characters that you want the returned binary number to have. If this is greater than the minimum, the binary number will be padded out using leading zeros. If omitted, the returned binary 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.
+ Display Octal and Binary Summary:
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 Page
Binary
The Binary (Base 2) Numeral System uses the digits 0 & 1.
The following table shows the first 8 binary values, along with the equivalent decimal values:
Binary  1  10  11  100  101  110  111  1000 
Decimal  1  2  3  4  5  6  7  8 
For further information on the binary numeral system, see the
Wikipedia Binary PageOct2Bin Function Examples
The following spreadsheet shows examples of the Excel Oct2Bin 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  =OCT2BIN( "5" ) 

2  =OCT2BIN( "0000000001" ) 

3  =OCT2BIN( "2", 10 ) 

4  =OCT2BIN( "7777777770" ) 

5  =OCT2BIN( "16" ) 

 Results:  A 

1  101 

2  1 

3  0000000010 

4  1111111000 

5  1110 


Note that, in the above example spreadsheet, the negative octal and binary numbers in cell A4 are represented by two's complement notation.
Further information and examples of the Excel Oct2Bin function can be found on the Microsoft Office website.
Oct2Bin Function Errors
If you get an error from your Excel Oct2Bin 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 an octal number or contains more than 10 characters
 the resulting binary 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
