Bi-fold Door PlannerEnter the opening, the frame and the number of panels. Get each panel width, the folded stack, the real clear opening and where a lead door works, with a plan you can fold open.

All sizes in mm. Panels folding right = panels − panels left. Frame, thickness, gaps and the panel size range differ between systems; the defaults are typical aluminium values, so check them against your maker's data sheet. The clear opening is measured between the folded stacks.