Blackout Level Estimator
Pick your fabric, lining and how it is fitted — and get an honest estimate of how dark the room will actually get. Indicative percentages; real darkness depends on sealing the edges.
Your curtain choice
Fabric sets the base block, lining adds to it, and the fit decides how much of that rating survives once light finds the edges. Numbers are indicative — test your own room before relying on them for shift sleep.
Estimated darkness
0%
Dim, not dark — fine for a daytime nap, not full blackout.
Fabric + lining rating
73%
before fit losses
Fit multiplier
0.92×
of the rating that survives
Light leaking past
6%
around the edges
Centre overlap
—
no effect
Where your darkness comes from — and what still leaks past the panels.
The honest part: it's the edges, not the fabric
Most “blackout” failures are light leaking around the sides, top and bottom gaps — not through the cloth. A premium blackout fabric hung loose over a window will let in far more light than a medium fabric sealed wall-to-wall and floor-to-ceiling. To actually get dark: mount the rod high and wide, overlap the panels at the centre, return the fabric to the wall, and let it pool slightly on the floor.
Plan a blackout bedroom with DesignAI
DesignAI recommends the fabric, lining and fitting detail to hit the darkness you need for your room and light.
Related Guides — Deep-dive reading
Blackout Curtains: The Complete Guide for Indian Homes (2026)
What “blackout” really means, how dark you actually get, the light-gap problem nobody warns you about, and how to choose, seal and care for them in Indian conditions.
Window TreatmentsDesigning Homes for Better Sleep
Sleep is built, not just behaved. Four environmental levers — darkness, a cool room, quiet and clean air — turn an ordinary Indian bedroom into one your body can actually rest in.
Healthy HomesBedroom Curtains: Blackout, Layering & Calm Sleep (India 2026)
Why blackout is non-negotiable for the room you sleep in, where dawn light actually leaks, how to layer sheer behind blackout, and the fabrics, colours and costs that make an Indian bedroom genuinely restful.
Window TreatmentsRelated Tools — You may also find these useful
Curtain Cost Calculator
Get the fabric metres you need plus the total curtain cost by window size, fabric, pleat, lining and hardware.
Curtain CalculatorCurtain Layering Planner
Get the right layer stack — sheer, dim-out, blackout or a blind — and the track type for your window.
PlannerCurtain Thermal Calculator
Estimate the solar heat-gain a curtain or blind cuts by orientation, glass and treatment — and the cooling saving.
Thermal Tool