Try...
Range("IV1").End(xlToLeft).Column

I prefer to use...

With ActiveSheet
lastRow = .Cells(.Rows.Count, "A").End(xlUp).Row
lastCol = .Cells(1, .Columns.Count).End(xlToLeft).Column
End With

"Ayo" wrote:

I know how to get the last cell in a column:

range("A65536").End(xlUp).address for the row number
range("A65536").End(xlUp).row for the row number

but I am not sure how to translate this to doing the same for the row.
Any help with be appreciated. Thanks.