Diagonal Borders in a Conditional Format

Parin likes using the diagonal border on some cells to show the value as "crossed out." She would like to use diagonal borders in a conditional format, however. When she tries, she can set other types of borders, but not a diagonal border—it is not selectable in the conditional format. She wonders if there is a way to use diagonal borders with conditional formats.

There is no direct way to do this when setting up a conditional format—Excel simply won't allow you to use diagonal borders with a conditional format. That means that you may want to look for and use an acceptable workaround. Here are a few ideas for the conditional format:

• Set the conditional format to use a font color that is the same as cell background color. That way the contents will seem to disappear if your condition is met.
• Set the conditional format to use one of the cell patterns. There are some that look like multiple diagonal lines through the cell.
• Set the conditional format to use strikethrough formatting for any text that appears in the cell.

If you actually want to use the diagonal borders, then the only way to do it is to apply an explicit format to the cell and not rely on a conditional format. This can be done through the use of a macro, such as the following:

Private Sub Worksheet_Change(ByVal Target As Range)
    Dim c As Variant
    Dim addr As String

    Set Target = Range("C12:C20")

    If Intersect(Target, ActiveCell) Is Nothing Then Exit Sub
    For Each c In Target
        If c = 0 And Len(c) <> 0 Then
            addr = c.Address
            With Range(addr).Borders(xlDiagonalUp)
                .LineStyle = xlContinuous
            End With
        ElseIf c > 0 And Len(c) > 0 Then
            addr = ActiveCell.Address
            With Range(addr).Borders(xlDiagonalUp)
                .LineStyle = xlNone
            End With
        End If
    Next
End Sub

You should right-click on a worksheet tab, display the code window from the resulting Context menu, and then paste this macro into the code window. The macro is executed any time a cell is changed in the worksheet. It checks the cells in C12:C20, and if any of them contain a zero value, then the diagonal border is set for that cell.

You can easily change the macro to apply to a different range of cells or to check for a different condition when applying the borders. If you prefer, you can change the xlDiagonalUp constant to xlDiagonalDown, depending on which diagonal border you want applied.

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (10693) applies to Microsoft Excel 2007, 2010, 2013, 2016, 2019, and Excel in Microsoft 365. You can find a version of this tip for the older menu interface of Excel here: Diagonal Borders in a Conditional Format.