The Curtain Formula
Four numbers. No caveats.
Rod Height Measure the gap between your window frame and the ceiling. Divide by 2. Hang the rod there.
- Example: 24" gap → hang rod 12" above the frame.
- Minimum 6" above the frame regardless.
Rod Width Window frame width + 12" on each side.
- Example: 40" window → 40 + 12 + 12 = 64" rod.
Panels (Rod width × 2) ÷ panel width = number of panels. Round up to nearest even number.
- Example: 64" rod, 50" panels → 128 ÷ 50 = 2.56 → buy 4 panels.
Length Pick one and commit:
- 1 inch above the floor → modern
- Touching → classic
- Pooling → dramatic
Never sill-length. Never hovering mid-wall.
| Decision | Rule |
|---|---|
| Rod height | Gap to ceiling ÷ 2 (min. 6" above frame) |
| Rod width | Frame width + 6–12" each side |
| Panels | (Rod width × 2) ÷ panel width, round up to even |
| Length | Floor or lower. Pick one. |
→ Full window treatment guide: here.

