Bay Curtain Planner is a local test build, not a live site. It is for US homeowners and renters measuring curtains themselves, working in inches.
It does one job: plan curtains for a bay window, a sliding door, or several windows on one wall from your own measurements, giving whole-run rod length, panel count, panel width, stated fullness, and length style together, plus stack space you enter for a sliding door and gap coverage from gaps you enter for a multi-window wall.
It does not sell curtains, does not take an order, shows no prices, and gives no guarantee of fit. All three planners in this complete test build are test tools only.
The site is maintained by Bay Curtain Planner Editor. See the measuring guide before you use the planner.
Photos on this test build are Pexels photos, free to use, credited where they appear: sliding glass doors with white curtains by Pew Nguyen, sheer curtains over a glass door by Mathias Reding, and warm sunlight through red curtains by Zişan Özdemir. They are illustrations of the niche, not products for sale, and no photo here is claimed to be a bay window.