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![Instructional diagram: 'How to Calculate Double Door Biparting Track Length'. The main formula is: Track Length = 4 x Door Width. To find the size for each of the two doors, the formulas are: Door Width = [Opening Width + (2 x Molding Width, or 4 inches if no molding)] / 2. The Door Height formula is: Door Height = Opening Height + (Molding Height, or 2 inches if no molding) - 1/2 inch.](http://thebarndoorhardwarestore.com/cdn/shop/files/Single-Track-Biparting-Double-Door-Open-Track-Length.png?v=1771517293&width=2048)
![Instructional diagram showing a pair of closed biparting doors, titled 'How to Calculate Double Door Biparting Track Length'. The main formula is: Track Length = 4 x Door Width. To find the size for each door, the formulas are: Door Width = [Opening Width + (2 x Molding Width, or 4 inches if no molding)] / 2. The Door Height formula is: Door Height = Opening Height + (Molding Height, or 2 inches if no molding) - 1/2 inch.](http://thebarndoorhardwarestore.com/cdn/shop/files/Single-Track-Biparting-Double-Door-Closed-Track-Length.png?v=1771517293&width=2048)
