Your Guide to Curtains and Window Treatments
How Wide Should Curtains Be?
To ensure that panels look ample and drapey when closed, they should have a combined width that is 2 to 2½ times the width of the window. Exceptions: If you’re hanging curtains just to frame a window and don’t intend to shut them, you can round down to 1½ times the width. Pleated panels have fullness built in, so their width should more or less match the span you’re covering.