A rule of thumb (from Architectural Digest) is that curtains should be hung between four to six inches above the window frame, so install your curtain rod accordingly. When you hang the curtain rod high, it will make the window appear taller.
Assuming you're outfitting a living room or bedroom with average ceiling height (8 feet high), an interior designer's rule of thumb would be to mount the curtain rod about a half-foot above the top of the window frame—even higher if the total space between the top of the window and the ceiling line is less than 12 ...
For the ideal middle ground, curtains should hover just above the floor. To find the right curtain length, measure from the floor to where you'll hang the rod (usually 4 to 6 inches above the window frame).
Standard curtains typically hang from about a half-inch from the floor to halfway between the window trim and average-height ceiling. But to maximize visual height, let the walls determine your curtain's length; in a living room, library, den or bedroom, the longer the panels, the better.
General Installation Recommendations
When installing curtain rods, hang the rod so that it extends at least 3 or 4 inches beyond the window on each side. This allows your curtains to overlap both the window and the wall to prevent light from leaking in around the window's edges.
Floor length: Long curtains that go from above your window frame all the way to the floor to create a traditional, formal look. Typical curtain length for this style is 84 to 96 inches; these curtains will fall about 1/4-inch above the floor. They are ideal for living rooms, bedrooms and dining rooms.
For a 9 foot ceiling, pick 96-inch curtains. Typically, your curtain rod is hung about a foot from the ceiling. 96 inches covers the distance between the floor up to one foot from the ceiling.
When hanging curtains, it is important that the curtains are the right length. Curtains that are too short make the room look short, stubby and awkward. The cut the length of the wall, making both the window and the room look smaller. An example of curtains that are way too short!
If you have the space between the top of your window frame and the ceiling or crown molding, though, you should hang the rod over the window. I like to go 3 to 5 inches down from the ceiling. Doing this visually extends the length of your wall, making your ceiling look higher.
All it needs is to let the curtain hem reach about 3/8 to ½ inches above the floor. Besides being easy to measure and design, it is also easiest to vacuum and maintain. If you are looking for curtains that don't require too much maintenance, this can be an excellent option for you.
The material should barely touch the floor or hover half an inch above. Use this approach for café curtains, too, short panels covering only the lower portion of a window, hitting the sill, which works well in kitchens and bathrooms, where long drapes or curtains aren't practical.
How High to Hang Curtains 8 Foot Ceiling. An 8 foot ceiling is pretty standard for a residential home. With this standard height will be safe to put the rod about 6 inches above the top of the framing of the window. This avoids any extra framing and gives space between the frame and the rod.
Sill Length
1/2" above the window sill. Casual and charming. These are the shortest of the standard curtain lengths, which makes them a good opportunity to have some fun with pattern or color. Since they take up less visual space, you won't get tired of a bold choice.
The height of your home's ceilings often determines the length of your curtain panels, as builders usually install taller windows in homes with higher ceilings. Ready-made curtains generally come in standard lengths: 84 inches for 8-foot ceilings, 96 inches for 9-foot ceilings and 108 inches for 10-foot ceilings.
"Extending your draperies from floor to ceiling and from wall to wall surrounding your window makes them appear bigger," explains Francesco Bilotto.
Do use curtains that reach the floor. Your curtains should either be 1/2” above the floor, kiss the floor, or puddle on the floor. For 8' ceilings, I recommend standard 96” curtains which you can then adjust up and down or hem up the bottom if needed.
Standard curtains come in three lengths—84 inches, 96 inches, or 108 inches. "Generally, you want to stay away from the 84 inch standard curtains unless you have very low ceilings. They don't look right in most scenarios and end up being an awkward length," says Curtis.
As a general rule of thumb, curtain width should be two to two-and-a-half times the width of the window. Curtains are typically sold as pairs, but you may need to double up depending on the size of your window.
Hanging long drapes on a short window is one of the easiest ways to increase the importance of the window and bring it into proportion to the room. Short drapes on a short window call attention to the size of the window and reduce the significance of the room, window and drapery style.
When you buy them in stores or online, there are two standard lengths: 84 inches and 95 or 96 inches. The length of the curtain dictates the height of the rod. If you buy 84-inch-long curtains, the rod must be mounted roughly 84 inches from the floor if the curtains hang from the rod without rings.
The top of most of our windows are 8ft, and we used 108″ panels almost everywhere. So we hung our curtain rod about 13 inches above the windows. The higher the curtain rod, the taller your window will appear. I recommend to always install a rod closer to the ceiling than the top of the window.
Hovering an inch or less above the floor
This option is also more forgiving than those that precisely hit the floor, which means your measuring and hemming won't be derailed if it's a few millimeters off. It also means you don't have to worry if you have slightly uneven floors.
Yes, curtains should be long enough to touch the floor. With a few exceptions, the longer the curtains are the more stylish and elegant it will look. This is why most standard ready-made curtains are lengthy. But the reality is that various decorating styles use different curtain lengths.
For curtains that are way too long, you may have a lot of excess fabric left. You can trim this extra material at the end, but if you don't want to cut the curtains, make 2 or 3 folds so the excess material is tucked in neatly.