Curtains look expensive when they are hung high and wide, full enough and the right length. This gets the numbers right before you order.
Curtain size calculator
Measure the window frame, and from the top of the frame to the floor.
Height
Mount the rod about 4 to 6 inches above the window frame; going higher, toward the ceiling, makes the room feel taller.
Width
Extend the rod past the frame so open curtains stack off the glass, and buy panels that add up to 2 to 2.5 times the rod width (3 times for sheers).
Length
Standard ready-made lengths are 63, 84, 95 (or 96), 108 and 120 inches. Measure from the top of the rod: for a tailored look end about half an inch above the floor; add 6 to 8 inches to puddle.
Sources
- Wayfair: how to measure for curtains (rod 4 to 6 in above the frame; 84 in panels for 8 ft ceilings)
- The Home Depot: measuring for window curtains (2 to 2.5 times the window width; sheers 3 times)
- Canadian Tire: how to hang curtains (half an inch above the floor; 6 to 8 in extra to puddle)
Sources last checked 1 November 2026.
Frequently asked questions
How wide should curtains be?
Together, 2 to 2.5 times the width of the rod, so they look full when closed.
What length curtains for 8 ft ceilings?
84 inches works for floor length when the rod is 4 to 6 inches above a standard window; 95 or 96 inches if you hang the rod higher.
How high should I hang a curtain rod?
At least 4 to 6 inches above the frame, or about halfway to the ceiling.