Measure the rod, not the window
A macrame panel hangs from the rod, and the knot pattern only reads properly with some slack in it. Take the width of your rod and add roughly a quarter to a half again for gather; a panel pulled flat loses the motif you bought it for. For length, measure from the rod down and stop an inch or two above the floor, unless you want the fringe to pool. Panel dimensions are given in inches on every product page.
Doorways, dividers and windows
Three different jobs. In a doorway, hang the rod or dowel on the trim, or mount hooks into studs above the frame with anchors if there are none. A loose hanging panel such as the cotton string curtain parts as you walk through and falls back on its own, which is what makes it usable as a room divider. At a window, a denser panel like the tasseled cotton curtain filters daylight into a pattern on the floor rather than blocking it.
Living with a knotted panel
Dust settles into the knots. A shake outdoors clears most of it, a vacuum on its lowest setting with clears the rest, and a cloth wrung out in cool water lifts marks. Cotton absorbs moisture, so a porch panel wants bringing in ahead of heavy rain. Privacy works in one direction only: a panel that screens a room in daylight will show shapes once a lamp is on behind it. A knotted holder gathers the whole thing to one side when you want the window back. The same cotton appears in our macrame pillows and bedding.