How Wide Should Curtains Be? Width & Fullness Guide
Quick answer: total curtain width should be about 2 to 2.5× the rod width. For a 36-in window, that's 72–90 in of fabric so the panels look full. Here's how to measure.
- Rod width first
- 2x fullness
- Window to panel chart
- Worked example
- One panel or two
- Common mistakes
Rod width first
Measure the rod width, not just the window. Mount the rod 8–12 in wider than the window on each side so panels can pull fully open and the window looks wider. Then base the curtain width on the rod measurement — that's what the fabric has to fill.
2x fullness
Curtains are sized by fullness: the ratio of fabric width to rod width. 2x (fabric = 2× rod) gives a soft, gathered look when closed — the standard. 1.5x looks flat; 3x is extra full and heavier. Start at 2x for a classic look.
Window to panel chart
| Window / rod width | Total fabric at 2x |
|---|---|
| 36 in | ~72–90 in |
| 48 in | ~96–120 in |
| 60 in | ~120–150 in |
| 96 in (slider) | ~192–240 in |
Most panels are sold 52 in wide per panel, so two panels give ~104 in — close to 2x on a 48–50 in rod.
Worked example
A 48-in window, rod extended to 60 in:
- Total fabric at 2x = 120 in
- Two 52-in panels ≈ 104 in — slightly under 2x but fine
- Two 60-in panels = 120 in — perfect 2x fullness
When in doubt, go fuller — panels that skimp on fullness look thin and let light bleed at the edges.
One panel or two
Use two panels that open to the sides for most windows; a single panel can work for narrow or fixed windows. With two, split the total width so each side is balanced. Panels that stack clear of the glass when open also frame the window nicely.
Common mistakes
- Using window width, not rod width. Base it on the rod.
- Skipping fullness. 1x looks like a sheet, not curtains.
- Panels too short on width. They won't overlap when closed.
- Rod not wider than the window. You lose light when open.
FAQ
Curtains should be about 2 to 2.5 times the width of the window (or rod) so they look full when closed. For a 36-in window, that's roughly 72–90 inches of panel width.
A 48-inch window takes about 96–120 inches of combined curtain width. If you hang the rod wider than the window (recommended), base it on the rod width, not the window.
Yes — mount the rod 8–12 inches wider than the window on each side so the panels can pull fully open and let in all the light, and the window reads wider.
2x fullness means the total fabric width is twice the rod width, which gives a soft, gathered look when closed. 1.5x looks flatter; 3x is extra luxurious.