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ExcelDec2OctFunction
The Excel DEC2OCT Function
Related Function:
Oct2Dec 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 Dec2Oct function converts a decimal number into an Octal (Base 8) number.
The format of the function is :
DEC2OCT( number, places )
Where the number argument is the decimal number that is to be converted to octal, and the
places argument is 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 the places argument is omitted, then by default, the minimum number of places is used in
the returned octal number.
+ Display Octal 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
Dec2Oct Function Examples
The following spreadsheet shows examples of the Excel Dec2Oct 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 
=DEC2OCT( 8 ) 
2 
=DEC2OCT( 18 ) 
3 
=DEC2OCT( 8, 10 ) 
4 
=DEC2OCT( 8 ) 
5 
=DEC2OCT( 237 ) 

Results:

A 
B 
1 
10 
Result is 1*8 + 0 
2 
22 
Result is 2*8 + 2 
3 
0000000010 
Result is 1*8 + 0 
4 
7777777770 
Result is 8^9 + 7*8^8 + 7*8^7 + ... + 7*8 + 0 
5 
355 
Result is 3*8^2 + 5*8 + 5 

Note that, in the above example spreadsheet, the negative octal number in cell A4 is represented by
two's complement notation.
Further information and examples of the Excel Dec2Oct function can be found on the
Microsoft Office website.
Dec2Oct Function Common Errors
If you get an error from your Excel Dec2Oct function this is likely to be one of the following :
Common Errors
#VALUE!



Occurs if either the supplied number argument or the supplied
places argument is not numeric.

#NUM!



Occurs if 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:
 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
