Exclude headers from calculation - excel

Question

The following code has a problem with calculation.
This calculation finds out the % of rows filled per column. However because of the headers, when a sheet has no values in the columns but has headers it shows as 50%, which isn't correct.
Is there any way to alter this so It doesn't include headers in the calculation? Would this be the best work around?
Sub Stackage()
'added function to skip corrupt files works! Adding skipped files works.. and do something about 50%.
'changed lrw to long, doesnt skip those files now :)
Dim wb As Workbook, fileNames As Object, errCheck As Boolean 'part of loop
Dim ws As Worksheet
Dim resultSheet As Worksheet
Dim i As Long
Dim lco As Integer
Dim lrw As Long
Dim resultRow As Integer
Dim measurement As Double
'To compile skipped files
Dim wksSkipped As Worksheet
Set wksSkipped = ThisWorkbook.Worksheets("Skipped")
Set resultSheet = Application.ActiveSheet
resultRow = 1
'Optimize Macro Speed
Application.ScreenUpdating = False
Application.EnableEvents = False
Application.Calculation = xlCalculationManual
'get user input for files to search
Set fileNames = CreateObject("Scripting.Dictionary")
errCheck = UserInput.FileDialogDictionary(fileNames)
If errCheck Then Exit Sub
For Each Key In fileNames 'loop through the dictionary
On Error Resume Next
Set wb = Workbooks.Open(fileNames(Key))
If Err.Number <> 0 Then
Set wb = Nothing ' or set a boolean error flag
End If
On Error GoTo 0 ' or custom error handler
If wb Is Nothing Then
wksSkipped.Cells(wksSkipped.Cells(wksSkipped.Rows.Count, "A").End(xlUp).Row + 1, 1) = fileNames(Key)
Else
Debug.Print "Successfully loaded " & fileNames(Key)
wb.Application.Visible = False 'make it not visible
For Each ws In wb.Worksheets
If Not Application.WorksheetFunction.CountA(ws.Cells) = 0 Then
'define the range to measure
lco = ws.Cells.Find("*", , xlValues, xlWhole, xlByColumns, xlPrevious, False).Column
lrw = ws.Columns("A:Y").Find("*", , xlValues, , xlRows, xlPrevious).Row
If lrw = 1 Then lrw = 2
For i = 1 To lco
measurement = Application.WorksheetFunction.CountA(ws.Range(ws.Cells(1, i), ws.Cells(lrw, i))) / lrw
resultSheet.Cells(resultRow, 1).Value = wb.Name
resultSheet.Cells(resultRow, 2).Value = ws.Name
resultSheet.Cells(resultRow, 3).Value = ws.Cells(1, i).Value
resultSheet.Cells(resultRow, 4).Style = "Percent"
resultSheet.Cells(resultRow, 5).Value = measurement
resultRow = resultRow + 1
Next
End If
Next
wb.Application.Visible = True '' I added
wb.Close savechanges:=False 'close the workbook do not save
Set wb = Nothing 'release the object
End If
Next 'End of the fileNames loop
Set fileNames = Nothing
'Message Box when tasks are completed
MsgBox "Task Complete!"
ResetSettings:
'Reset Macro Optimization Settings
Application.EnableEvents = True
Application.Calculation = xlCalculationAutomatic
Application.ScreenUpdating = True
End Sub
Function Col_Letter(lngCol As Long) As String
Dim vArr
vArr = Split(Cells(1, lngCol).Address(True, False), "$")
Col_Letter = vArr(0)
End Function

Answer 1

Make one small change to this line:
measurement = Application.WorksheetFunction.CountA(ws.Range(ws.Cells(1, i), ws.Cells(lrw, i))) / lrw
Change it to this:
measurement = ws.Evaluate("sumproduct((" & ws.Range(ws.Cells(2, i), ws.Cells(lrw, i)).Address & "<>"""")+0)") / (lrw - 1)