How much drywall does a garage need?
The room
Openings
21 sq ft each
15 sq ft each
An overhead door is not a front door. A 16 × 7 ft door is 112 sq ft — type the real number or you will buy four sheets you do not need.
Sheet size
Thickness
The default for walls on framing at 16 in centres.
Waste is 10%, 0 outside corners. Defaults are fine for most rooms.
Room plan
shape only, not to scale
You need
26sheets
4 × 8 ft · 1/2 in · 10% waste
wallboardcalc.com
Materials
$495
at your prices
- Walls
- 864 sq ft
- Openings
- −133 sq ft
- Net area to board
- 731 sq ft
- Sheets before waste
- 23 → 26
- Weight to carry
- 1,481 lb
The top course is a 1.0 ft rip. Cut every course from the same end and the offcuts stay long enough to reuse.
What to put in the cart
Finishing follows the manufacturer coverage rates: 10 gal of mud and 370 ft of tape per 1,000 sq ft.
- 1$416
26 × 4 × 8 ft 1/2 in drywall sheets
- 2$27
3 × 1 lb box of 1-1/4 in drywall screws (about 640 screws)
- 3$14
2 × 250 ft roll of paper joint tape (271 ft needed)
- 4$38
2 × 4.5 gal pail of all-purpose joint compound (7.3 gal needed)
The whole setup lives in the link — send it to whoever is helping.