You can use this VBA code:
Code:
Sub MakeSquare()
Dim WPChar As Double
Dim DInch As Double
Dim Temp As String
Temp = InputBox("Height and width in inches?")
DInch = Val(Temp)
If DInch > 0 And DInch < 2.5 Then
For Each c In ActiveWindow.RangeSelection.Columns
WPChar = c.Width / c.ColumnWidth
c.ColumnWidth = ((DInch * 72) / WPChar)
Next c
For Each r In ActiveWindow.RangeSelection.Rows
r.RowHeight = (DInch * 72)
Next r
End If
End Sub