Log()
         Brian Element
      
      This function calculates the natural log (base e) of the specified number. The value that is returned is of a type double. To see an example of how to calculate the log of a base 10 see the snippets section.
Script
              Sub Main
    Dim MyNumber As Integer
    MyNumber = 15
    MsgBox Log(MyNumber)
End Sub
IDEAScript Language
Yes you can, I found this
Yes you can, I found this article that outline it - https://docs.microsoft.com/en-us/office/vba/language/reference/user-interface-help/log-function
So this would be a function to a log 10
Function log10(x)
     log10 = Log(x) / Log(10)
End Function
 
         
Log with base other than e
Is it possible to perform Log() with a base other than e?