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在Excel中可以通过FACT函数来计算非负整数n的阶乘（n!)，而如果要通过VBA来计算阶乘，可以用下面的两个自定义函数：

1.使用循环：

Function Factorial_a(ByVal Num As Integer)
If Num < 0 Then
Factorial_a = "#NUM!"
Else
Factorial_a = 1
For i = 1 To Num
Factorial_a = Factorial_a * i
Next
End If
End Function

2.使用递归：

Function Factorial_b(ByVal Num As Integer)
If Num < 0 Then
Factorial_b = "#NUM!"
ElseIf Num = 0 Or Num = 1 Then
Factorial_b = 1
Else
Factorial_b = Num * Factorial_b(Num - 1)
End If
End Function