What's your rod length？
What's your window width？ (Frame outer edge to edge.)
What's the height from bottom tip of rod to floor.
What's the height from window top to floor？
How many inches beyond your window frame would the rod extend？
Wider panels will be roughly 10-15'' when kept stacked back- will be more for wide windows and doors.
How many inches above the window frame would you mount the rod？
To provide visual height to room, mount rod closer to ceiling line. In general, rods should be mounted at least 6-8'' above window frame, if you have wall space.
Do you want single or split panels？
What king of finished look would you like for your drapes？
Choose fullness based on that.
What kind of finished length would you like for your drapes？
Your recommended dimensions for your panel are