Width = Rod/Track Width * Fullness/Number of Panels Length = Measure from the clip to floor + Bottom (Flat Panel) Measure from the hole for the hooks to the floor + Bottom (Flat Hooks) Measure from the hole for the hooks to the floor + Bottom (Pencil Pleat) 1 Inch + Measure from the very top of the rod to floor + Bottom (Back Tab) Different Bottom Measurement 1/2" Above the Floor: -1/2" Kiss the Floor: 0 Puddling: +2" For more pudding, add a longer bottom. Read the blog about the flat panel.