When measuring for Roman or Balloon shades you need
to decide on an inside or outside mount first. For inside mounts
measure the exact width and length inside the frame.
If you would like to cover the window frame and want
the mount board to be attached to the frame, measure the exact width of
the whole frame and the length would be from the very top of the window
frame down to the length you desire.
If you want an outside mount to the wall which
completely covers the window frame and then some. Measure the complete
area you wish to cover and be sure to account for 1 1/2" above the frame
for the mounting board and hardware. As you can see from the instructions
above the finished size of the shade, which includes the thickness of the mounting
board, will be exactly the same as the measurements given.