Easily calculate the required trim opening dimensions for a wide range of door configurations, jamb types, and wall constructions. This tool supports single, double, door-and-a-half, cavity slider, and multi-fold doors, including fire-rated, acoustic, and X-ray applications. Simply select your door setup, enter your measurements, and get instant, precise trim opening sizes—complete with notes for special requirements. Perfect for builders, architects, and contractors seeking fast, reliable door frame calculations.