Garage Door Size Calculator
Calculate the recommended garage door width and height based on your vehicle dimensions and required clearances.
Results will appear here.
Formula
Door Width = (Vehicle Width × Number of Cars) + (2 × Side Clearance) + ((Number of Cars − 1) × Between-Car Clearance)
Door Height = Vehicle Height + Top Clearance
The calculated minimums are then rounded up to the nearest standard garage door size.
Assumptions & References
- Default side clearance of 12 inches per side is recommended by the International Door Association (IDA) for comfortable entry.
- Default top clearance of 12 inches accommodates door hardware, springs, and opener rail.
- Default between-car clearance of 12 inches allows door opening without contact.
- Standard door widths (ft): 8, 9, 10, 12, 14, 16, 18, 20, 24.
- Standard door heights (ft): 7, 8, 9, 10.
- Average passenger car width: ~70–80 in; SUV/truck: ~80–96 in.
- Average passenger car height: ~55–65 in; SUV/truck: ~65–75 in.
- Reference: International Door Association (IDA) sizing guidelines; DASMA (Door & Access Systems Manufacturers Association) standard sizes.