"If my window is 78 inches wide, should I get 2 or 4 of the 48-inch panels?" That exact question is on r/interiordecorating, and a version of it gets asked every week: two panels or four, one long rod or three short ones, and why do my curtains look like they're barely covering anything?
Short answer: add up the panel widths. They should total about twice the width of the rod, and the rod should run about 8 inches past the window on each side. For most windows wider than about 40 inches, that means 4 standard panels, not 2.
Step 1: Size the rod, not the window
The rod should extend roughly 8 inches past each side of the window frame, more if you want the curtains to stack fully off the glass when open. So:
Rod width = window width (including trim) + 16 inches
Hanging the rod wide makes the window look bigger and lets in more daylight. It's one of the most upvoted tips in every curtain thread.
Step 2: Multiply for fullness
Flat curtains look cheap. They need gathers, even when closed.
| Look | Total panel width |
|---|---|
| Flat, minimal | 1.5× rod width |
| Standard, softly gathered | 2× rod width |
| Full, luxurious | 2.5× rod width |
Standard (2×) is the safe choice. One Reddit drapery pro put it simply: it depends on how full you want them, but most people are happier with more fabric than they planned.
Step 3: Divide by your panel width and round up to a pair
Panels = (rod width × fullness) ÷ panel width, rounded up to an even number so both sides match.
Our Curtain Panels Calculator does all three steps for you.
Worked examples (standard 2× fullness)
| Window | Rod | Fabric needed | With 50" panels | With 54" panels |
|---|---|---|---|---|
| 34 in | 50 in | 100 in | 2 panels | 2 panels |
| 48 in | 64 in | 128 in | 4 panels (3 is uneven) | 4 panels |
| 78 in | 94 in | 188 in | 4 panels | 4 panels |
| 128 in (3 windows) | 144 in | 288 in | 6 panels | 6 panels |
So the answer to the 78-inch question is 4 panels. Two 48-inch panels add up to 96 inches, which barely stretches across a 94-inch rod. They'd look flat and skimpy, which is exactly what the poster was worried about.
One long rod or several short ones?
For a row of windows close together, the most common Reddit advice is one long rod across all of them. It reads as one big window and looks more custom. Split rods only make sense when there's real wall (more than a couple of feet) between the windows, or a corner.
With one long rod over several windows, you can hang a pair at the far ends and one or two in the middle, so you can close each window separately.
Don't forget length
- Hang the rod 4–6 inches above the window frame, or halfway to the ceiling for a taller look.
- Panels should just kiss the floor or float half an inch above it. High-water curtains are the other common mistake.
- Measure from the rod (or the rings) to the floor before you order. 84-inch panels are often too short once the rod goes up.
Two panels or one per window?
One panel per window, pulled to one side, can work on narrow windows or in a modern room. But the top answer in a 110+ comment r/DesignMyRoom thread was clear: two panels per window for most rooms. They frame the window evenly and close in the middle.
Not sure how the room will look with new curtains, colors or furniture? Upload a photo to the AI room designer and try it on your actual space first.
Frequently asked questions
How many curtain panels do I need for a 72 inch window?
With the rod extended 8 inches each side (88 inches), you need about 176 inches of fabric for a standard look. That's 4 panels of 50 or 54 inches.
How wide should curtains be compared to the window?
The total width of all panels should be about twice the width of the rod, which itself runs about 16 inches wider than the window.
Should curtain panels touch the floor?
Yes, or float just above it. Panels that stop above the floor make the window and ceiling look lower.
Is it better to have 2 or 4 curtain panels?
For windows up to about 40 inches wide, 2 panels are usually enough. For wider windows, 4 panels give the fullness that makes curtains look finished.