What is FACTDOUBLE Function in Excel?
The FACTDOUBLE function is one of the math functions of Excel.
It Returns the double factorial of a number.
We can find this function in Math & trig category of insert function Tab.
How to use FACTDOUBLE function in excel
- Click on an empty cell (like F5 )

2. Click on fx icon (or press shift+F3)

3. In the insert function tab you will see all functions

4. Select math and trig category
5. Select FACTDOUBLE function
6. Then select ok

7. In the function arguments Tab you will see FACTDOUBLE function
8. Number is the value for which to return the double factorial
9. You will see results in the formula result section

Examples of FACTDOUBLE function in Excel
Example 1:
How to use FACTDOUBLE function in excel
You can see examples of FACTDOUBLE function below:

factdouble(5) ----->>>>answer is 15
factdouble(4) ----->>>>answer is 8
factdouble(3) ----->>>>answer is 3
factdouble(1) ----->>>>answer is 1
factdouble(0) ----->>>>answer is 1
What is the purpose of FACTDOUBLE function?
It Returns the double factorial of a number.
What is the Return value of FACTDOUBLE function?
It returns a number.
How many arguments does FACTDOUBLE function have?
This function has just 1 Argument.
The argument of FACTDOUBLE function is number.
Number is the value for which to return the double factorial.
The argument of FACTDOUBLE function is required and not optional.
FACTDOUBLE(number) = number
Which version of excel supports FACTDOUBLE function?
This function is available for all excel versions (2003-2019)