How Many Sheets of Drywall for a 12×16 Room?
Quick Answer
A 12×16 room with 8-foot ceilings has about 640 square feet of walls and ceiling. Using 4×8 sheets (32 sq ft each), you need 20 sheets, or about 22 sheets after a 10% waste factor.
- Wall + ceiling area: ~640 sq ft
- 4×8 sheet covers 32 sq ft
- Base count: 20 sheets → 22 with 10% waste
- Add ~11 lbs of screws and 5 gallons of joint compound
Formula
Add wall area (perimeter × height) and ceiling area, then divide by 32 square feet per 4×8 sheet. Add 10% for cuts and waste.
Step-by-Step Calculation
- 1
Wall area
(12+16+12+16) × 8 = 448 sq ft
- 2
Ceiling area
12 × 16 = 192 sq ft
- 3
Total ÷ 32
640 ÷ 32 = 20 sheets
- 4
Add 10% waste
20 × 1.10 = 22 sheets
Drywall Sheets by Room Size (8-ft ceilings)
| Room Size | Walls + Ceiling | 4×8 Sheets | With 10% Waste |
|---|---|---|---|
| 12×12 | 528 sq ft | 17 | 18 |
| 12×16 | 640 sq ft | 20 | 22 |
| 12×20 | 752 sq ft | 24 | 26 |
| 16×20 | 896 sq ft | 28 | 31 |
Counts include walls and ceiling. Using 4×12 sheets instead of 4×8 reduces the number of joints to finish.
Frequently Asked Questions
How much does it cost to drywall a 12×16 room?
Materials (22 sheets, screws, tape, compound) run $350–$550. Professional hanging and finishing costs $1,000–$2,000 for a room this size, or about $1.50–$3.00 per square foot installed.
Should I use 4×8 or 4×12 drywall sheets?
Use 4×12 sheets on long walls to cut down on butt joints, which are harder to finish invisibly. 4×8 sheets are lighter and easier to handle solo, especially on ceilings.
How much joint compound for a 12×16 room?
Plan on about 4 to 5 gallons of ready-mixed joint compound and one roll (250–500 ft) of paper or mesh tape for a room needing 22 sheets, covering three coats over the seams.