## Purpose

## Return value

## Arguments

*number*- The number to get the factorial of.

## Syntax

## How to use

The Excel FACT function returns the factorial of a given number. In mathematics, the factorial of a non-negative integer **n** is the product of all positive integers less than or equal to **n**, represented with the syntax **n!**

FACT takes just one argument, *number*, which should be a positive integer. If *number* is not an integer, the decimal portion of *number* will be removed before the factorial is calculated.

### Examples

```
=FACT(3) // returns 6
=FACT(4) // returns 24
=FACT(5) // returns 120
```

If *number* is not an integer it will be truncated to an integer:

```
=FACT(3.2) // returns 6
```

When number is zero, FACT returns 1:

```
=FACT(0) // returns 1
```

If number is negative, FACT returns the #NUM! error:

```
=FACT(-3) // returns #NUM!
```

### Notes

*Number*cannot be negative or FACT will return the #NUM error.- If
*number*is not an integer it will be truncated to an integer, then solved.