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## Excel FACTDOUBLE Function

Author: SunLast Modified: 2022-03-03

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

### Description

The FACTDOUBLE function returns the double factorial of a given number. For example, FACTDOUBLE(5)=15, equivalent 5 x 3 x 1.

### Syntax and arguments

Formula syntax

FACTDOUBLE(number)

Arguments

 Number: Required, the number that you want to get the double factorial of.

Return Value

The FACTDOUBLE function returns a positive number.

Errors

#VALUE! error value occurs when the argument number is not a numeric value.

#NUM! error value occurs when the argument number is a negative value.

Remarks

1. If the argument number is not an integer, it will be truncated to an integer.

2. A double factorial is symbolized by double exclamation marks !!.

3. The FACTDOUBLE function is calculated differently for even and odd numbers:

Even number:

n=n x (n-1) x (n-2) x … x 2 x 1

Odd number:

n!!=n x (n-2) x … x 3 x 1

Version

Excel 2003 or later

### Usage and Examples

Example: basic usage

In range C3:G3, contains the numbers that you need to get the corresponding the factorial of, please use formula as this:

=FACT(C3) //or directly use a number in the formula =FACT(1)

Press Enter key to get the first result, then drag autofill handle right to get other factorials.

#### Relative Functions:

• Excel FACT Function
The FACT function eturns the factorial of a given number. For example, FACT(5)=120, equivalent to 5 x 4 x 3 x 2 x 1.

• Excel PV Function
The PV function returns the present value of a loan or an investment based on a constant interest rate.

• Excel RECEIVED Function
The RECEIVED function returns the amount received at maturity for a fully invested security.

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