Autosum column using column header - excel

Question

How to autosum column using column header in vba code? I am trying to autosum few columns in excel sheet but column position is changing every time.
Dim Rng As Range
Dim c As Range
Set Rng = Range("F1:F" & Range("F1").End(xlDown).Row)
Set c = Range("F1").End(xlDown).Offset(1, 0)
c.Formula = "=SUM(" & Rng.Address(False, False) & ")"
Set Rng = Range("G1:G" & Range("G1").End(xlDown).Row)
Set c = Range("G1").End(xlDown).Offset(1, 0)
c.Formula = "=SUM(" & Rng.Address(False, False) & ")"
Set Rng = Range("H1:H" & Range("H1").End(xlDown).Row)
Set c = Range("H1").End(xlDown).Offset(1, 0)
c.Formula = "=SUM(" & Rng.Address(False, False) & ")"

Answer 1

Find Headers to Insert Autosum (Application.Match)
It is assumed that the headers are in the first row of the worksheet's used range.
Sub InsertAutosum()
Dim Headers(): Headers = Array("Sales 2020", "Sales 2021", "Sales 2022")
Dim ws As Worksheet: Set ws = ActiveSheet
Dim trg As Range ' Table Range
With ws.UsedRange
Dim lCell As Range
Set lCell = .Find("*", , xlFormulas, , xlByRows, xlPrevious)
If lCell Is Nothing Then Exit Sub
Set trg = .Resize(lCell.Row - .Row + 1)
End With
Dim hrg As Range: Set hrg = trg.Rows(1) ' Header Range
Dim trCount As Long: trCount = trg.Rows.Count
Dim srg As Range: Set srg = trg.Resize(trCount - 1).Offset(1) ' Sum Range
Dim Header, cIndex, sFormula As String
For Each Header In Headers
cIndex = Application.Match(Header, hrg, 0)
If IsNumeric(cIndex) Then
sFormula = "=SUM(" & srg.Columns(cIndex).Address(, 0) & ")"
hrg.Offset(trCount).Cells(cIndex).Formula = sFormula
End If
Next Header
End Sub

Answer 2

how to autosum column using column header in vba code
If you know the column header, then it becomes very easy. Here is an example. Let's say the header of the column is SOME-HEADER and we are not sure which column it is in but the headers are in row 1. If they are not in row 1 then you will have to tweak the code accordingly.
I have commented the code but if you still have a question then simply ask.
Option Explicit
Sub Sample()
Dim Ws As Worksheet
Dim HeaderText As String
Dim HeaderRow As Long
Dim HeaderColumn As Long
Dim LastRow As Long
Dim LastColumn As Long
Dim rng As Range
Dim i As Long
'~~> Change this to the relevant worksheet
Set Ws = Sheet1
'~~> Column Header text. Change as applicable
HeaderText = "SOME-HEADER"
'~~> Headers are in row 1. Change as applicable
HeaderRow = 1
With Ws
'~~> Check if there is data in the worksheet
If Application.WorksheetFunction.CountA(.Cells) = 0 Then
MsgBox "There is no data in thw worksheet"
Exit Sub
End If
'~~> Find last column
LastColumn = .Cells(HeaderRow, .Columns.Count).End(xlToLeft).Column
'~~> We can use .Find to find the header row but it may be an overkill
'~~> So we use a simple loop
For i = 1 To LastColumn
'~~> Checking for an exact match.
If UCase(Trim(.Cells(HeaderRow, i).Value)) = UCase(Trim(HeaderText)) Then
HeaderColumn = i
Exit For
End If
Next i
'~~> Check if we found the column
If HeaderColumn = 0 Then
MsgBox "Unable to find the column"
Exit Sub
End If
'~~> Find the last row in the column
LastRow = .Cells(.Rows.Count, HeaderColumn).End(xlUp).Row
'~~> This is the range
Set rng = .Range(.Cells(2, HeaderColumn), .Cells(LastRow, HeaderColumn))
'~~> Insert Sum Formula
.Cells(LastRow + 1, HeaderColumn).Formula = "=Sum(" & _
rng.Address(False, False) & _
")"
End With
End Sub
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