Floor-length is the way to go, unless there’s a radiator or a deep sill in the way. Measure from the floor to where you’ll hang the rod, then round up. Here are two surefire approaches:

  • Just Hitting the Floor or Sill: This look is classic and tailored; it makes sense if you’ll be opening and closing the curtains a lot, because they’ll easily fall back into place every time you move them. The fabric should just touch the floor or hover half an inch above. This is also a great approach for spots like the kitchen and bathroom, where long drapes aren’t practical.
  • Breaking Slightly at the Floor: Panels that extend onto the floor by one to three inches are the most stylish right now. They’re more relaxed than those that graze the floor. If you have uneven floors or are worried about precision measuring, this style is more forgiving. In formal rooms, an exaggerated take—six or so inches of fabric pooling on the floor—can look romantic but is also high-maintenance; curtains need refluffing every time you vacuum or the cat lies on them.