You can find curtains in a few standard lengths.
Curtain rod length for standard window.
To accomplish that you would need to make sure the curtain rod is at least 20 inches larger than the original window size of 48 inches or 68 inches.
This look offers a few advantages.
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This would result in all 48 inches of window glass showing when curtains are fully opened.
This doesn t mean these are the only curtain lengths it s just what you re likely to find online and in stores ready made.
Windows with plenty of wall space on either side can afford a longer rod and larger finials.
When installing curtain rods hang the rod so that it extends at least 3 or 4 inches beyond the window on each side which allows your curtains to overlap both the window and the wall to prevent light from leaking in around the window s edges.
Measure 3 6 inches 7 6 15 2 cm beyond the window frame for rod length.
The most commonly sought after sizes and styles feature a 1 and 3 8 inch in diameter size curtain rod to a 2 inch curtain rod typically for windows with a length measuring between 66 120 inches.
The curtain will hang 3 inches below the bottom of the window sill.
Also the hung curtains will completely cover the window frame.