Curtain Wall Design Calculator

This calculator takes off curtain wall system quantities for a facade: glass panel count, mullion count, transom count, total glass area, and structural sealant length. Facade Width sets how many vertical mullion bays the wall splits into, using Mullion Spacing, and Facade Height sets how many horizontal rows of panels stack up, using Panel Height -- both dimensions drive Glass Panels directly, since panel count is columns multiplied by rows. Panel Width has its own field for describing each glass unit, yet Glass Panels, Vertical Mullions, and Horizontal Transoms never reference it at all; it only comes into play once the panel grid is already fixed, scaling Total Glass Area and Structural Sealant from there.

Design Wind Load is a genuinely important structural input for real curtain wall engineering, but none of this calculator's takeoff formulas touch it -- every output here stays identical whether 10 psf or 100 psf is entered. In practice Mullion Spacing and Panel Width should be set to match each other, since the panel grid is actually determined by spacing and Panel Height, not by Panel Width itself, even though the two describe overlapping physical dimensions. Always verify structural glazing capacity for the real design wind load with a licensed engineer before construction.