Standard Garage Door Sizes
Ordering a garage door starts with one question: which of the standard garage door sizes fits your vehicles? Enter how many vehicles you need to fit and their height and width, and this calculator picks the recommended standard door, the rough opening to frame, and the headroom your track will need — instantly.
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How to use this calculator
Pick the number of vehicles the garage must hold. Choose vehicle height: standard covers cars, crossovers, and most SUVs up to 7 feet tall; tall/RV covers RVs, tall vans, and trucks with roof racks that need a taller door. Then pick vehicle width — compact for small cars on narrow driveways, wide truck if you park a full-size truck or dually.
Your results update instantly as you change the selections: the recommended standard door size, its alternative options, the rough opening dimensions to frame, and the estimated headroom needed for a standard track.
How it works
The calculator matches your inputs against the six most common standard garage door sizes. Single-car doors are 8 × 7 ft and 9 × 7 ft (plus 10 × 7 ft for wider vehicles), double-car doors are 16 × 7 ft and 18 × 7 ft, and oversize RV doors are 8 × 10 ft and 10 × 12 ft. Two vehicles get a double door as the primary recommendation; three or more vehicles get a double door plus one single door per additional vehicle.
The rough opening is the framed opening the door frame sits in. The common rule of thumb used here is 2 inches wider and 1.5 inches taller than the door — so a 16 × 7 ft door needs a 16'2" × 7'1.5" opening, and a 9 × 7 ft door needs a 9'2" × 7'1.5" opening. Headroom is the clearance between the top of the opening and the ceiling for the door track: roughly 12–14 inches for a standard track (oversize doors often need a little more). These are planning estimates; always confirm with your door manufacturer's installation instructions.
This is a sizing guide, not engineering advice. Exact rough-opening and headroom requirements vary by manufacturer, track type (standard, low-headroom, or high-lift), and opener model.
Frequently asked questions
What is the standard garage door size for a single car?
The standard single-car garage door is 9 feet wide by 7 feet tall (9 × 7 ft). An 8 × 7 ft door is also standard and works for compact cars and narrow driveways, while a 10 × 7 ft door fits wide vehicles like full-size trucks.
What size garage door do I need for a 2-car garage?
A 2-car garage typically uses one 16 × 7 ft double door. An 18 × 7 ft door is a common upgrade for extra clearance on each side. Two single 9 × 7 ft doors are another standard option if you prefer separate openings.
What size is an RV garage door?
Oversize RV garage doors are commonly 10 × 12 ft, with 8 × 10 ft as a smaller oversize option. They give tall vehicles like RVs, tall vans, and trucks with roof racks the height a standard 7-ft door cannot.
What is the rough opening for a garage door?
A common rule of thumb is to frame the rough opening 2 inches wider and 1.5 inches taller than the door. For example, a 16 × 7 ft door needs a rough opening of about 16'2" × 7'1.5". Always confirm with your door manufacturer's instructions.