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Bedroom · Tool · 5 min ·

How to size blackout curtains so no light sneaks in: a planner

Blackout curtains only work if they reach past the window. A thick curtain that stops at the frame still lets a glowing outline of light in around every edge.

Enter your own measurements in the planner and see where light leaks, how long the rod should be, how many panels you need and what drop to look for. It also covers how to measure first, what to check at each budget, and rental-friendly options.

What to buy, if anything

Affiliate links, marked sponsored. Examples that match this guide, not tested reviews. Prices checked 3 Oct; every shop is on each product page.

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