DEC2OCT function

This article describes the formula syntax and usage of the DEC2OCT function in Microsoft Excel.


Converts a decimal number to octal.


DEC2OCT(number, [places])

The DEC2OCT function syntax has the following arguments:

  • Number    Required. The decimal integer you want to convert. If number is negative, places is ignored and DEC2OCT returns a 10-character (30-bit) octal number in which the most significant bit is the sign bit. The remaining 29 bits are magnitude bits. Negative numbers are represented using two's-complement notation.

  • Places    Optional. The number of characters to use. If places is omitted, DEC2OCT uses the minimum number of characters necessary. Places is useful for padding the return value with leading 0s (zeros).


  • If number < -536,870,912 or if number > 536,870,911, DEC2OCT returns the #NUM! error value.

  • If number is nonnumeric, DEC2OCT returns the #VALUE! error value.

  • If DEC2OCT requires more than places characters, it returns the #NUM! error value.

  • If places is not an integer, it is truncated.

  • If places is nonnumeric, DEC2OCT returns the #VALUE! error value.

  • If places is negative, DEC2OCT returns the #NUM! error value.


Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter. If you need to, you can adjust the column widths to see all the data.




=DEC2OCT(58, 3)

Converts decimal 58 to octal



Converts decimal to octal.


Applies To: Excel 2016, Excel 2010, Excel Starter, Excel 2013, Excel Online, Excel 2016 for Mac, Excel for Mac 2011, Excel 2007

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