Divide the wall and ceiling area by 32 sq. ft. per 4 x 8 sheet, add 10 percent for waste, and round up. A 12 x 14 ft. room with an 8 ft. ceiling needs about 21 sheets, 700 screws, one 250 ft. roll of tape and roughly 6 gallons of joint compound. This guide walks through the takeoff step by step so a Los Angeles remodel or ADU crew orders the whole drywall basket once instead of making a second trip.
How many sheets of drywall do I need?
Measure each wall's length and height, add the ceiling area, and total the square footage. Divide by the sheet area and round up. Skip subtracting doors and windows unless an opening is larger than about 4 x 4 ft., because the offcuts rarely get reused and the 10 percent waste allowance covers them.
Worked example: 12 x 14 ft. room
Walls: 52 ft. of perimeter x 8 ft. high = 416 sq. ft. Ceiling: 12 x 14 = 168 sq. ft. Total = 584 sq. ft. Divide by 32 = 18.3 sheets. Add 10 percent and round up to 21 sheets of 4 x 8.
| Item |
Rule |
12x14 room |
| Sheets |
32 sq ft each, +10% |
21 sheets |
| Screws |
32 per sheet |
About 700 |
| Tape |
0.4 ft per sq ft |
One 250 ft roll |
| Compound |
1 gal per 100 sq ft |
About 6 gal |
Which sheet size and thickness?
Longer sheets mean fewer seams to tape, and that is where finishing time goes. On ceilings and tall walls, a 4 x 12 sheet can cut seams in half. Thickness follows the job: 1/2 in. is standard for walls, and 5/8 in. is used where a fire rating or a flatter ceiling is needed.
| Sheet |
Area |
Best for |
| 4 x 8 ft. |
32 sq ft |
Standard rooms |
| 4 x 10 ft. |
40 sq ft |
9 ft. walls |
| 4 x 12 ft. |
48 sq ft |
Ceilings, long runs |
Browse the full drywall sheets collection for 1/4, 3/8, 1/2 and 5/8 in. panels, UltraLight and Mold Tough options. In Los Angeles, garage walls shared with living space and ADU separation walls typically call for Type X; our 5/8 in. Type X firecode drywall guide explains when. If sound control matters too, see the soundproofing guide.
How many screws do I need?
Plan on about 32 screws per 4 x 8 sheet, spaced roughly 12 in. apart on ceilings and 16 in. on walls. For 21 sheets that is about 700 screws, which is a few 1 lb. packs, while a whole-house job is easier to buy by the 20 or 25 lb. box. Use 1-1/4 in. screws for 1/2 in. board and 1-5/8 in. for 5/8 in. board. Our coarse vs fine thread screw guide explains which thread fits wood and steel studs, and the drywall screws collection has every pack size.
How much tape, mud and corner bead?
Every seam needs tape, and a room works out to about 0.4 ft. of tape per sq. ft. of board. The 12 x 14 room above needs one 250 ft. roll. Paper is stronger at inside corners and mesh is faster on flat seams; the paper vs mesh tape guide covers the trade-off, and the drywall tape collection carries both.
Joint compound
Budget about 1 gallon of premixed compound per 100 sq. ft. of board for tape, fill and finish coats, so the sample room needs about 6 gallons. A 3.5 gal. taping and topping pail or a 4 gal. all-purpose pail is the usual size, and the joint compound guide explains which type to pick for each coat.
Corner bead
Count each outside corner and doorway edge, and buy one 8 or 10 ft. stick for every 8 to 10 ft. of corner. See the corner bead types comparison to choose metal, vinyl or paper-faced.
Do not forget the finishing tools
A pan, knives and a hawk are part of the takeoff, since the crew cannot finish without them. Our drywall tools guide sorts them by finishing stage, and the drywall tools collection has them all.
Drywall takeoff checklist
- Total wall and ceiling square footage, then divide by the sheet area
- Add 10 percent for waste and round up
- Pick sheet length to minimize seams
- Screws: about 32 per 4 x 8 sheet
- Tape: about 0.4 ft. per sq. ft.
- Compound: about 1 gallon per 100 sq. ft.
- Corner bead for every outside corner
- Knives, pan and hawk for finishing
Conclusions
Area divided by sheet size, plus 10 percent, gives the sheet count, and every other material scales from the same square footage. Order screws, tape, mud and bead with the board so the job does not stall at the first coat. The figures here are planning rules of thumb; confirm coverage on the product label before ordering large quantities.
