FACTDOUBLE

Returns the double factorial of a number (i.e. number!!). Double factorial of zero returns 1 by definition.

For even numbers, FACTDOUBLE(number) returns: 2*4*6*8* ... *number
For odd numbers, FACTDOUBLE(number) returns: 1*3*5*7* ... *number

Syntax

FACTDOUBLE(number)

number: The number whose double factorial value you want to calculate. Eg., 4.6

Remarks

The decimal points (if any) are truncated before calculating the double factorial of the given number.

Examples

Formula	Result
=FACTDOUBLE(4.6)	8
=FACTDOUBLE(10)	3840
=FACTDOUBLE(0)	1

Get a hands-on experience of the function in the embedded range below.

Possible Errors

Errors	Meaning
#N/A!	The function could not find the value it was asked to look for. Commonly occurs in VLOOKUP and similar functions.
#NAME!	The function name is incorrect or invalid. The given defined name (if any) is invalid. There is a typo in the defined name used in the function. Double quotes are missing for text values in the function. Colon missing in a cell range reference.
#VALUE!	The given argument's data type is incorrect or invalid. For example, the function =DATE(A1:A3) will return a #VALUE error when a text value is present in the range.
#REF!	The given cell reference is incorrect or invalid. This error may occur when a cell/range has been deleted, moved, or pasted over.

Similar Functions

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