While Norman SmartDrape™ shades are fully custom window treatments, the track widths are only available in set sizes, in 4-inch increments. That’s because the sheer portion of each SmartDrape vane is exactly 4 inches, and Norman designed the system so that every vane is always perfectly and consistently spaced.

Because track sizes come in specific increments, choosing the right size is crucial to achieving the look and function you want. As a rule of thumb, US Verticals recommends a minimum overlap of 6″ per side on any door or window—but many homeowners prefer more overlap for aesthetic reasons, better light control, or added privacy.

For example: what if you want a center-opening (split stack) SmartDrape, but you also want the fabric to fully clear the doorway when open? Before this calculator, you’d need to work through those calculations by hand.

This calculator was built to save time and remove the guesswork. It’s designed for window treatment professionals and homeowners alike, so your SmartDrape can look absolutely perfect in every application.