The short answer: for a bedroom, choose blackout fabric, which blocks 99 to 100 percent of light, in panels that add up to 2 to 2.5 times the rod's width. Extend the rod 3 to 12 inches past the frame on each side so the panels can clear the glass by day and overlap it at night, and keep every cord out of a child's reach.
Curtains in a living room are mostly about looks and a little privacy. In a bedroom they also decide how well you sleep, how early the summer sun wakes you, and how much of the street light gets in. That puts the fabric first and the decoration second. For the rod height, our hanging height calculator works out the mark on the wall and the panel length to order.
Why Dark Matters
The Sleep Foundation's guide to light and sleep puts it first: make the bedroom "as dark as possible." Sleeping with a light on, it adds, "interferes with sleep cycles and causes more fragmented sleep."
The threshold is lower than most people think. Harvard Health's article on light at night explains that light suppresses melatonin, and that "a mere eight lux - a level of brightness exceeded by most table lamps and about twice that of a night light - has an effect." A street light outside the window or a June sunrise at 5:30 is easily that bright.
Blackout, Room Darkening, Light Filtering
The three words on curtain packaging describe how much light the fabric stops. They are not regulated, and retailers draw the lines in different places:
| Label | SelectBlinds | Blindster |
|---|---|---|
| Blackout | 99–100% | 100% |
| Room darkening | about 70–99% | 95–99% |
| Light filtering | — | under 95% |
Sources: SelectBlinds and Blindster, both window-covering retailers.
The spread in "room darkening" is the useful lesson: a fabric sold under that name can let through almost a third of the light, or almost none. If darkness is the goal, look for the word blackout, or for a curtain with a separate blackout lining. A lining also lets you keep the face fabric you actually like, linen or velvet or a print, and still get a dark room.
The other route is layering: a sheer on the front rod for daytime privacy and softness, a blackout panel or a lined curtain on the back rod for the night. A double rod or a rod plus a ceiling track does this without crowding the window.
Erstellt mit AIWidth: Fullness, Not Flat Fabric
A curtain that is exactly as wide as the window looks like a sheet when it's closed and lets light in at both edges. The Shade Store, which makes custom drapery, says in its measuring guide that curtains "should be 1.5 to 2 times the width of the area they cover", so "if your window or curtain rod spans 60 inches, your total curtain panel width should be between 90 and 120 inches." That is the floor; in a bedroom, where the closed panels also have to block light at the edges, aim for the fuller end. Kwik-Hang's measuring guide calls 2 times the standard fullness, 2.5 times deluxe and 3 times the maximum, and puts it plainly: "Never buy curtains that match your window's exact width."
| Rod width | 2× (standard) | 2.5× (fuller) |
|---|---|---|
| 48 in | 96 in | 120 in |
| 60 in | 120 in | 150 in |
| 72 in | 144 in | 180 in |
At 2×, that is simply two panels each as wide as the rod.
Sheers are the exception that runs the other way: thin fabric needs more of it, about 2.5 to 3 times the width according to The Shade Store, or it looks skimpy.
Fit: Stopping the Light at the Edges
Most of the light that gets past a blackout curtain comes round the sides and over the top, not through the fabric. The fit fixes that.
Make the rod wider than the window. Kwik-Hang says to extend the rod 3 to 6 inches past the frame on each side, and wider for heavy drapes, so the open panels "stack beside the glass instead of over it." The Shade Store's figure is 6 to 12 inches. In a bedroom, the generous end has a second benefit: closed panels overlap the frame instead of stopping at its edge.
Close the sides. A wraparound rod, which curves back to the wall at both ends, or a "return" (the curtain's outer edge fixed back to the wall) shuts the gap at the sides that a straight rod leaves.
Close the top. Light spills over a rod that sits well below the ceiling. A rod mounted high, or a ceiling track, leaves less of a gap. The calculator shows how high to go and the panel length that follows.
Overlap in the middle. Two panels that just meet in the centre will part slightly. A little extra fullness, or a center overlap on a traverse rod, keeps them closed.
Length: To the Floor
In a bedroom, floor length is the default: it looks finished and it blocks light at the bottom. The Shade Store lists the common options as "sill length (to the windowsill), floor length (just clearing the floor) and puddle length (3 to 6 inches of extra fabric on the floor)." Kwik-Hang adds finer grades: hover stops about an inch above the floor, kiss just grazes it, and break adds an inch so the fabric bends on the floor.
Sill length makes sense over a radiator or a built-in bench. A puddle is a romantic look but gathers dust and gets caught under a vacuum, so it suits a guest room better than the main bedroom. Measure from the rod (or the rings) down, never from the top of the window.
Erstellt mit AICords and Children
Curtains themselves rarely have cords, but the blinds behind them, the draw cords on traverse rods and the cords on tiebacks do. The U.S. Consumer Product Safety Commission's 2022 rule on window-covering cords records "a total of 209 reported fatal and near-miss strangulations on window covering cords" among children 8 and under from January 2009 through December 2021, and concludes that "reliance on parental supervision and warning labels are inadequate." It notes that, under the industry standard, stock window coverings must have no operating cords, inaccessible cords, or short cords of 8 inches or less.
In a child's room:
- cordless blinds or shades behind the curtains;
- tiebacks without loose loops;
- a wand or motor on a traverse rod instead of a draw cord;
- the crib or bed placed where a child standing on it can't reach the window.
Curtains and the Rest of the Room
Bedroom curtains carry a lot of the room's color. Our bedroom paint colors guide explains how the evening lamplight shifts a wall, which affects curtain fabric just as much. For art on the wall above the bed, see the bedroom wall art guide; for the pale, airy version of the room, the coastal bedroom guide covers linen and light.
The Short Version
- Fabric: blackout blocks 99–100% of light; "room darkening" can mean 70–99% depending on the retailer.
- Width: total panels 2–2.5 times the rod width (120 in of fabric for a 60-in rod at 2×; 1.5× is the bare minimum); sheers 2.5–3×.
- Rod: 3–12 in past the frame on each side, so panels clear the glass by day and overlap it at night.
- Edges: wraparound rod or returns at the sides, a high rod or ceiling track at the top.
- Length: to the floor; measure from the rod down. Height and length: the hanging height calculator.
- Safety: no reachable cords in a child's room (CPSC: 209 strangulations and near misses, 2009–2021).
