Here is a VBA solution.

Change the H1:H10 to the range of your choice

Private Sub Worksheet_Change(ByVal Target As Range)

On Error GoTo ws_exit:
Application.EnableEvents = False
If Not Intersect(Target, Me.Range("H1:H10")) Is Nothing Then
With Target
If IsNumeric(.Value) Then
.Value = .Value * 1.08
End If
End With
End If

ws_exit:
Application.EnableEvents = True
End Sub

'This is worksheet event code, which means that it needs to be
'placed in the appropriate worksheet code module, not a standard
'code module. To do this, right-click on the sheet tab, select
'the View Code option from the menu, and paste the code in.

--

HTH

RP

"Chris B." wrote in message
m...
I am trying to have excel add 8% to a number automatically when I enter
into a cell