Private Sub Worksheet_Change(ByVal Target As Range)
If Target.CountLarge <> 1 Then Exit Sub
If Intersect([Tableau1[[Janvier]:[Décembre]]], Target) Is Nothing Then Exit Sub
Application.EnableEvents = False
Target.FormulaR1C1 = "=" & Trim$(Str$(Target.Value)) & "-[@[Poids du fauteuil]]"
Application.EnableEvents = True
End Sub