Curtain Measuring Guideline
The curtain length is typically measured from the top edge of the grommet or rod pocket. Any excess fabric above this area is usually called a header and is NOT included in the measured length.
The length of curtains you choose is a matter of personal preference or taste. Adjust your rod to the desired height to enable your curtain to fall where you would like. Some like it to hover just above the floor, while others like it to touch creating a luxurious puddling effect.
Take note of the width of the curtain width to determine how full you would like your window to look. For proper fullness, curtains should be 1 1/2 to 3 times the width of the window area you would like to cover. Less fullness will produce a more tailored look, while more will create a richer appearance.
For an outside mount, window hardware is installed 1 to 3 inches above the top edge of the window frame. Measure horizontally from the outside edge of one side of the window frame moulding to the other outside edge.