What is the rough opening for a 16 x 7 garage door?

Clopay says the finished opening matches the door: 16 ft by 7 ft. With a standard torsion track it needs 12 in of headroom, 3¾ in each side, and about 8 ft 6 in of backroom, plus more for an opener.

Is the rough opening bigger than the door?

The finished opening, after jambs, matches the door. The framed rough opening is larger by the jamb material. Doors on steel jambs are often ordered about 2 in wider, per Clopay.

How much headroom does a garage door need?

12 in for standard torsion springs and 10 in for extension springs, per Clopay. Low-headroom kits go down to about 4½ in.

How much backroom does a garage door need?

Door height plus 18 in on a standard residential track (Clopay FAQ; its track guide says plus 16 in). Low-headroom tracks need more. An opener adds more again.

What if I do not have enough headroom?

A low-headroom track or a wall-mount opener. See wall-mount openers .

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Garage door rough opening calculator

The finished opening matches the door. The room around it depends on the track, and the opener needs more.

Door height + 18 in backroom for a standard residential track Clopay FAQ. Headroom 12 in for torsion, 10 in for extension springs; sideroom 3¾ in each side.

This garage door rough opening calculator, also a garage door size calculator, gives the room a door needs. Clopay says the finished opening should be the same size as the door.

A standard residential track with torsion springs needs 12 in of headroom and 3¾ in of sideroom each side. Backroom is the door height plus 18 in. Low-headroom and high-lift tracks change those numbers, and an opener needs more.

Door size, then the track

Clopay’s published residential figures. Nothing is emailed.

— Finished opening

— Headroom

— Sideroom

— Backroom

What this assumed —

Your door’s installation manual and your opener’s manual are final.

How much room does each track type need?

Clopay publishes these clearances for residential doors. The track type is the biggest variable.

Track type	Headroom	Sideroom (each side)	Backroom
Standard, torsion springs	12 in	3¾ in (FAQ) to 4½ in (track guide)	Door height + 18 in (FAQ); + 16 in (track guide)
Standard, extension springs	10 in	3¾ in	Door height + 18 in
Low headroom, front mount	About 9 in	4½ in	Door height + 23 in
Low headroom, rear mount	4½ in	7½ in	Door height + 30 in
High lift	Lift amount + at least 9½ in	4½ in or more	Usually door height + 18 in

An opener needs more headroom and backroom than the door alone. Its manual lists the extra. Where Clopay’s two pages differ, the calculator uses the FAQ figures for a standard track (3¾ in sideroom, door height + 18 in backroom).

How do I measure a garage door opening?

Measure the finished opening, not the framing. The door is ordered to match it.

Width. Measure between the finished jambs at the top, middle and bottom. Use the smallest.

Height. Measure from the floor to the underside of the finished header, at both sides and the middle. Floors are often out of level, so note the difference.

Headroom. From the top of the opening to the lowest thing on the ceiling: a beam, duct, pipe or light.

Sideroom. From each side of the opening to the nearest wall or obstruction.

Backroom. From the opening back to the nearest obstruction along the ceiling.

Clopay says the finished opening should be the same size as the door. See the rough opening guide for framing, and headroom and backroom for the terms.

What if my garage is short on room?

A different track or opener usually solves it. Changing the framing is the last resort.

Low headroom: a low-headroom track kit, or a wall-mount (jackshaft) opener that frees the ceiling. See wall-mount opener installation.

Short backroom: a low-headroom rear-mount needs more backroom, not less, so check both. A vertical-lift track needs less backroom but much more headroom.

Narrow sideroom: torsion hardware needs less than some extension setups. A new or wider opening means a new header, and that is structural work. See garage door installation.

Questions this calculator answers

What is the rough opening for a 16 x 7 garage door?: Clopay says the finished opening matches the door: 16 ft by 7 ft. With a standard torsion track it needs 12 in of headroom, 3¾ in each side, and about 8 ft 6 in of backroom, plus more for an opener.
Is the rough opening bigger than the door?: The finished opening, after jambs, matches the door. The framed rough opening is larger by the jamb material. Doors on steel jambs are often ordered about 2 in wider, per Clopay.
How much headroom does a garage door need?: 12 in for standard torsion springs and 10 in for extension springs, per Clopay. Low-headroom kits go down to about 4½ in.
How much backroom does a garage door need?: Door height plus 18 in on a standard residential track (Clopay FAQ; its track guide says plus 16 in). Low-headroom tracks need more. An opener adds more again.
What if I do not have enough headroom?: A low-headroom track or a wall-mount opener. See wall-mount openers.

Sources and methodology

Figures dated October 26, 2026. Last reviewed August 16, 2026.

Garage door FAQ: sizes, headroom, sideroom, backroom (Clopay, retrieved 2026-10-26. Standard sizes, finished opening equals door size, headroom 10 in (extension) or 12 in (torsion), sideroom 3¾ in, backroom door height + 18 in.)
Garage door track options: headroom and specs (Clopay, retrieved 2026-10-26. Clearances for standard, low-headroom and high-lift tracks.)

Garage door rough opening guide Framing and measuring.
Standard garage door sizes The sizes doors come in.
Headroom The term, defined.
Garage door installation New and altered openings.

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