The Excel HEX2OCT Function

Related Function:
Oct2Hex Function

Basic Description

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 supplied number argument must not be 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 0-9 and the characters a-f, they should be enclosed in quotation marks when they are supplied to an Excel function. (e.g. The hexadecimal 11a should be input as "11a").

  +   Display Hexadecimal and Octal Summary:

Hexadecimal

The Hexadecimal (Base 16) Numeral System uses the digits 0-9 and the characters a-f.

The following table shows the first 32 hexadecimal values, along with the equivalent decimal values:

Hexadecimal123456789abcdef101112131415161718191a1b1c1d1e1f20
Decimal1234567891011121314151617181920212223242526272829303132

For further information on the hexadecimal numeral system, see the Wikipedia Hexadecimal Page


Octal

The Octal (Base 8) Numeral System uses the digits 0-7.

The following table shows the first 16 octal values, along with the equivalent decimal values:

Octal1234567101112131415161720
Decimal12345678910111213141516

For further information on the octal numeral system, see the Wikipedia Octal Page

Excel Hex2Oct Function Examples

The following spreadsheets show examples of the Excel Hex2Oct function.

 Formulas:
 A
1=HEX2OCT( "A" )
2=HEX2OCT( "000000000F" )
3=HEX2OCT( "8", 10 )
4=HEX2OCT( "FFFFFFFFF8" )
5=HEX2OCT( "1F3" )
 Results:
 A
112
217
30000000010
47777777770
5763

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 the Excel Hex2Oct function this is likely to be one of the following:

Common Errors
#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 or > 10.
#VALUE!-Occurs if the supplied [places] argument is not recognised as a number.