Garage Door Size Calculator
Determine the right garage door and garage dimensions based on your vehicles and storage needs.
Get recommended width and height.
How Garage Door Sizing Works
Choosing the right garage door size depends on your vehicle dimensions, available headroom, side room, and backroom. Undersizing causes clearance problems; oversizing wastes wall space and costs more.
Standard sizes:
| Door Type | Width × Height |
|---|---|
| Single car | 8×7 ft or 9×7 ft |
| Single car (tall) | 8×8 ft or 9×8 ft |
| Double car | 16×7 ft or 16×8 ft |
| RV / oversized | 10×10 ft or 12×12 ft |
Width calculation:
Minimum door width = Vehicle width + 6 inches (each side clearance)
A standard pickup truck is 79 inches wide. Add 12 inches total:
79 + 12 = 91 inches ≈ round up to 9 ft door
Height calculation:
Most cars clear a 7 ft door easily. Add clearance for:
- SUVs and trucks: use 8 ft minimum
- Cargo vans / campers: use 9–10 ft
- Lifted trucks: measure from ground to highest fixed point + 6 inches
Required headroom (above door opening):
- Standard torsion spring system: 12 inches minimum
- Low-headroom brackets: as little as 4.5 inches (specialty hardware)
Required side room:
- Standard: 3.75 inches each side
- Insulated doors: may need up to 5.5 inches
Required backroom (depth behind door when open):
Backroom = Door height + 18 inches (for opener travel)
An 8 ft tall door needs at least 9.5 ft of backroom depth behind the opening.
Always measure your widest vehicle before ordering — the door is permanent, the vehicle may change.