Get the last row of a column in Excel, without VBA

Question

In general, getting the last row of a given column in Excel is easily done with a User-Defined Function in VBA:

Function lastRow(wsName As String, Optional c         


        

Answer 1

This one (without an array formula)

=LOOKUP(2,1/(NOT(ISBLANK(A:A))),ROW(A:A)) 

How does it work?

1. NOT(ISBLANK(A:A)) returns an array of True and False
2. 1/(NOT(ISBLANK(A:A))) then 1 divided by that array results in another array of 1 or #DIV/0! which is used as lookup_vector
3. We use 2 as lookup_value which cannot be found because the largest value in the lookup_array is 1, so lookup will match the last 1 in the array.
4. As result_vector we use ROW(A:A) to get the row number of the last used cell
   (alternatively use A:A to get the value instead of the row number).