What we build
The site turns user-controlled measurements into transparent calculations for curtain width, length, fullness, rod span, fabric yardage, and shower-curtain sizing. Original proportional diagrams help explain the result without pretending to render a finished room.
What we do not claim
We do not claim that a calculation guarantees fit, that our content replaces a manufacturer specification, or that the site has physically tested every product. We do not publish drilling, structural fixing, load-bearing, electrical or motorized-system, fire-safety, accessibility-compliance, mold, allergy, medical, or indoor-air-quality advice.
Corded window coverings
Curtain Size Lab does not recommend corded blinds or shades, provide cord instructions, or make child-safety guarantees. For current window-covering cord safety guidance, use the U.S. Consumer Product Safety Commission resource below.
Advertising and paid links
Curtain Size Lab currently shows no display advertising or paid product links and has no lead form. If that changes, paid relationships will be disclosed clearly. Cookieless aggregate Cloudflare Web Analytics is the only audience measurement enabled.