Private Sub Worksheet_Change(ByVal R As Range)
If R.Count > 1 Then Exit Sub
If R = "" Then Exit Sub
Dim k As Single
k = 2.2046244
Application.EnableEvents = 0
Select Case R.Address(0, 0)
Case "F13", "AA13", "F35", "AA35", "F57", "AA57", "F79", "AA79", "F101", "AA101"
R(1, 10) = R * k
Case "O13", "AJ13", "O35", "AJ35", "O57", "AJ57", "O79", "AJ79", "O101", "AJ101"
R(1, -8) = R / k
End Select
Application.EnableEvents = -1
End Sub