Curtain Size Planner

Enter your window width and where the rod goes; the drawing shows the curtain length and panels to buy. A rod 84½ in up needs 84 in panels for floor length.

Your curtains, to scaleFront view: rod 84½ in above the floor, 11½ in below the ceiling; 84 in panels.84½ in84 in11½ in
Drawn to scale, each grid square one foot. Left: curtain length. Right: rod height from the floor. Top: gap to the ceiling.

Where should it stop?
Fullness

The rule

  • Floor-length curtains stop no more than half an inch above the floor (Wayfair).
  • Sill-length curtains stop about half an inch above the sill (Wayfair).
  • A puddle adds 6 to 12 inches to the floor length (Wayfair).
  • The panels together are 1.5 times (tailored) to 2 times (full) the window width (Wayfair).
  • The rod runs 6 inches past each side of the window, 12 inches in total (Wayfair).
  • Ready-made lengths come in bands, so buy the next length up and hem or hang it to fit (Wayfair).
  • Standard off-the-shelf curtain panels are usually 48 inches wide (Homes & Gardens).

Sources

  1. Wayfair: How to Measure for Curtains, checked
  2. Homes & Gardens: How Wide Should Curtain Panels Be?, checked

Rules checked