Using the Excel FACT Function
SummaryThe Excel FACT function is used to return the factorial of a number. The factorial of a number is simply the product of the number and all those below it. For example, =FACT(4) is the same as 4 x 3 x 2 x 1 and both return 24.
The number argument is required in the FACT function. This is the number for which you want to find the factorial. Number must be non-negative. If it is not an integer, it will be truncated.