How to choose the right blackout curtains
Updated June 2026Independently researchedNo paid placement.
The best blackout curtains for 2026 block at least 90% of incoming light and also add insulation. Focus on fabric density, backing type, and proper fit rather than price alone, and choose between thermal-lined, triple-weave, or room-darkening options based on your room’s needs.
What are blackout curtains and how do they actually work?
Blackout curtains are specially constructed window treatments designed to block most or all external light from entering a room. They achieve this through dense fabric weaves, multiple layers, or a foam-like coating on the back that absorbs and reflects light before it can pass through. Not all blackout curtains are created equal. True blackout curtains typically block 95–99% of light, while “room-darkening” curtains stop around 80–90%. The difference matters if you’re a shift worker, a light sleeper, or setting up a home theater. Look for terms like “triple-weave,” “thermal-backed,” or “100% blackout” on the label. Many modern blackout curtains also add thermal insulation by trapping air between layers, which helps keep rooms cooler in summer and warmer in winter. This dual function makes them a smart choice for energy-conscious buyers.
Blackout vs. thermal curtains: what’s the difference?
The terms “blackout” and “thermal” are often used interchangeably, but they refer to different features. A blackout curtain is designed primarily to block light, while a thermal curtain is designed to insulate against heat transfer. Many curtains combine both properties, but not all. A dedicated thermal curtain usually has a thick foam or flannel lining that blocks drafts and reduces sound transmission, but it may only be “room-darkening” rather than fully blackout. Conversely, a true blackout curtain can still be thin if it uses a reflective coating, offering less insulation. For most homes, the best compromise is a curtain that explicitly markets itself as both “blackout and thermal.” These typically have a dense triple-weave fabric with an insulating middle layer. Brands like Nicetown and Eclipse offer popular options that perform well in both areas without breaking the bank.
How to measure your windows for blackout curtains
Getting the right size is one of the most common mistakes. Blackout curtains work best when they extend well beyond the window frame. For maximum light blockage, the curtain rod should be mounted four to six inches above the window trim and extend three to six inches past each side. This prevents light from leaking around the edges. Measure the width of your window, then double it to account for adequate fullness. A pair of panels that are too narrow will look skimpy and let in light through gaps. For standard windows, a width of about two to three times the window width is ideal. Also measure the drop from the rod to where you want the curtains to end, just above the floor is the most polished look. If you’re using double rods for a sheer + blackout combo, account for the extra depth. And always check the product description for the finished width per panel, not the total set width, this is a common point of confusion.
Key features to look for in a quality blackout curtain
Fabric weight and construction matter most. Heavier fabrics like velvet or polyester blends with a thick lining block more light and drape better. Look for curtains with a “triple-weave” construction, which sandwiches a black core between two colored layers. This type won’t fade or develop pinholes over time, unlike some coated curtains. Check the header style. Grommet tops are easy to slide open and close, but they leave small gaps at the top where light can sneak in. Rod-pocket styles conceal the rod better but can be harder to draw. For maximum darkness, consider curtains with a “thermal-backed” or “interlined” construction that includes a separate blackout lining. Don’t overlook maintenance. Many budget-friendly blackout curtains are machine-washable on a gentle cycle, which is a huge convenience. Some cheaper curtains have a foam backing that can peel or yellow after washing. Read recent owner reviews to confirm durability after cleaning.
Do blackout curtains reduce noise?
Yes, but with realistic expectations. Blackout curtains can dampen high-frequency sounds like traffic hum or barking dogs because the dense fabric absorbs sound waves. However, they won’t block loud, low-frequency noise like bass thumping or heavy construction. To maximize sound absorption, choose curtains with thick, multi-layer construction and hang them as close to the window as possible, letting the fabric pool slightly on the floor. Overlapping two panels in the center creates an extra layer of barrier. If noise reduction is your primary goal, look specifically for “soundproof” or “acoustic” curtains, these are often heavier (with a gsm rating over 500) and may include a felt-like interlining. But keep in mind that even the best curtain will only reduce sound by a few decibels. For serious noise control, combine curtains with window inserts or heavier drapes.
How to choose the right color and style for your room
Dark colors block light more effectively than light ones, but the difference is smaller than you might think. A quality blackout curtain in white or light gray will still block a very high percentage of light because the blocking comes from the inner layers, not the face fabric. That said, dark navy, charcoal, or black will give you the absolute best light suppression if you need a pitch-black room. Style-wise, blackout curtains are available in nearly every design: pinch-pleat, grommet, tab-top, rod-pocket, and even sheer hybrids with a blackout liner. For a modern look, grommet panels with a smooth satin finish are popular. For a traditional or layered window treatment, consider rod-pocket panels that can be paired with a valance. Patterns can help hide dust and wrinkles, but note that some low-cost printed curtains may have a plasticized back that feels stiff. For a softer, more natural drape, choose a fabric with a woven pattern rather than a printed coating. Brands like Sunzero and Deconovo offer a wide range of solid and patterned options with consistent quality.
Frequently asked questions
Do blackout curtains block all light?
No curtain blocks 100% of light. The best blackout curtains block 95–99%, but some light will always leak around the edges, through the rod gap, or through the fabric if it’s very thin. To get as close to total darkness as possible, choose a triple-weave curtain, mount the rod tightly to the wall, and use side channels or velcro strips to seal the edges.
Are room-darkening curtains the same as blackout curtains?
No. Room-darkening curtains block about 80–90% of light and are often lighter in weight. True blackout curtains block 95% or more and are typically heavier with a specialized backing or weave. If you need near-total darkness for sleeping or media rooms, look for the term “100% blackout” on the label.
Can I wash blackout curtains?
Yes, many are machine-washable, but always check the care label. Wash on a gentle cycle with cold water and tumble dry on low or hang to dry. Avoid fabric softener, which can break down the blackout coating over time. Some cheaper curtains with foam backing should be spot-cleaned only to prevent peeling.
Do blackout curtains save energy?
Yes, especially when paired with thermal insulation. The dense fabric and additional lining reduce heat transfer through the window, keeping rooms cooler in summer and warmer in winter. This can lower heating and cooling costs, though the savings depend on your climate, window type, and how well the curtains fit.
How long do blackout curtains last?
With proper care, quality blackout curtains last 3 to 5 years before the backing begins to degrade or the fabric fades. Triple-weave or interlined curtains tend to last longer than those with a simple foam coating. Rotate panels and avoid direct sun exposure when not in use to extend their life.
Are blackout curtains safe for children and pets?
Yes, but choose cordless designs or wrap cords out of reach. Many blackout curtains come with cordless operation or motorized options for added safety. Also ensure the curtain rod is securely mounted, as heavy blackout panels can pull down a poorly anchored rod.