Step 1: How Dark Does the Room Need to Be
This is the single most important decision.
A laminated backing (branded as Thermaback by Eclipse, and similarly by other premium lines) blocks 98% or more of light and is worth the premium for shift workers, light-sensitive sleepers, or rooms facing intense direct sun.
A woven-only fabric without a laminated backing typically blocks 90% to 95%, which is a meaningful darkening for general bedroom use, nurseries used during the day, or rooms with moderate rather than intense sun exposure.
Step 2: Measure the Window Correctly
Total curta in width when closed should be at least 2 to 2.5 times the window's actual width, to ensure full overlap with no gap at the sides.
This is the most common reason a "blackout" curta in still lets in light.
Undersized panels, not weak fabric, are usually the real problem.
Step 3: Pair or Single Panels
A matched pair simplifies the purchase and guarantees consistent color and fabric between both sides of the window.
Single panels still make sense for a narrow window needing only one panel, or when a specific single-panel line, like Eclipse's laminated options, outperforms the available pairs at a similar price.
Step 4: Pick the Darkest Practical Color
Darker colors block meaningfully more light than lighter ones in the same product line.
Reserve lighter colors for rooms w here full-dark performance is a secondary priority behind the room's overall decor.
Step 5: Match the Length to the Room
Measure from the intended rod height to the desired ending point (floor, sill, or a few inches above the floor) before assuming a standard 84-inch length fits.
Most brands sell 63, 84, 95, and 108 inch options specifically because ceiling heights and rod placement vary.
Our picks
Products we recommend
As an Amazon Associate I earn from qualifying purchases. Picks are based on manufacturer specs, independent reviews and owner reports.
Top pickEclipse
Thermaback backing is the most effective light and heat blocker in this list
- 52 x 84 inch single panel, grommet top
- Thermaback triple-weave blackout backing
- Blocks 98% to 99.9% of light
- Reduces energy loss through the window
- Machine washable
✓ Pros
- Thermaback backing is the most effective light and heat blocker in this list
- Noticeably reduces afternoon heat buildup in a west-facing room
- Available in dark colorways that maximize both light and heat blocking
✕ Cons
- Sold per panel, so a full pair costs roughly double the single-panel price
- Stiffer fabric hand-feel than a fabric-only curtain
Exclusive Home Curtains
Sheer overlay softens the look of the room during the day, useful for a nursery that doubles as a playroom
- 52 x 63 inch pair, hidden tab/rod pocket top
- Layered sheer overlay over a solid blackout lining
- Softer, more decorative look than a solid blackout panel
- Machine washable
- Available in multiple color combinations
✓ Pros
- Sheer overlay softens the look of the room during the day, useful for a nursery that doubles as a playroom
- Blackout lining still blocks most light once fully closed
- No cords, hangs from a rod pocket or hidden tabs
✕ Cons
- Layered construction blocks slightly less light than a solid single-layer blackout panel
- 63-inch length is short for taller nursery windows
Best overallEclipse
37-inch width is proportionally right for a narrow window, unlike bulkier 52-inch panels
- 37 x 84 inch single panel, rod pocket top
- Thermaback blackout backing
- Blocks over 99% of light
- Reduces noise and insulates against heat and cold
- Machine washable
✓ Pros
- 37-inch width is proportionally right for a narrow window, unlike bulkier 52-inch panels
- Blocks over 99% of light, matching the wider Eclipse Palisade panel
- Rod pocket top gives a traditional, gathered look that suits a small decorative window
✕ Cons
- Rod pocket top is slower to open and close than a grommet panel
- 84-inch length needs hemming for a shorter small window
FAQ
Common questions
What's the single most important factor in choosing a blackout curtain?
How completely dark the room actually needs to be. A shift worker sleeping through peak daylight or a room facing intense direct sun needs a laminated backing (Thermaback or similar) that blocks 98%+ of light. A room that just needs a general dimming for better sleep, or a nursery that also functions as a daytime playroom, can do well with a woven fabric blocking 90% to 95%, often at a lower price.
Should I buy single panels or a matched pair?
A matched pair, when available at a reasonable price, is simpler and ensures consistent color and fabric across the whole window. Single panels are still a reasonable choice when only one panel is needed for a narrow window, or when a specific single-panel line offers better light-blocking performance than the pair-based alternatives at a similar price.
How much should I expect to spend on a genuinely effective blackout curtain?
The ma in tradeoffs as price increases are the finish (sateen versus matte), whether it ships as a matched pair, and consistency of blocking rate across colors, more than a simple better-or-worse performance gap.
Does the color of the curta in matter for performance, not just looks?
Darker colors consistently block a higher percentage of light than lighter colors at the same fabric construction, typically by 3 to 10 percentage points depending on the brand and backing type. For a room w here maximum darkness matters most, choose the darkest available color in a given product line.
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