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Excel OCT2DEC Function

doc dec2oct 1

If you want to follow along with this tutorial, please download the example spreadsheet.

doc dec2oct 1


The Excel OCT2DEC function converts an octal number to a decimal number.

Syntax and arguments

Formula syntax



  • Number: Required, the octal number that needs to be converted to a decimal number. The number may not contain more than 10 characters (30-bits). The most significant bits of the number indicates if the number is positive or negative, the remaining bits indicate the magnitude of the number. Negative numbers are represented using two’s-complement notation.

Return Value

The OCT2DEC function returns a decimal number.


Return #NUM! error if the argument number is > 777 or < 7777777000 or an invalid octal value.


Excel 2003 and later versions

Usage and Examples


There is a list of octal numbers placed in B:B10, to get the corresponding decimal numbers, please copy or enter the below formula to the next cell of the range:


Press Enter key and drag the auto-fill handle down to get all decimal numbers.

doc dec2oct 1

If you just use the formula once, you also can directly type arguments in the formula:


Relative Functions:

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