How Many Sheets of Drywall for a 12×12 Room?
Quick Answer
A 12×12 foot room with 8-foot ceilings needs approximately 18 sheets of 4×8 drywall for the walls (after subtracting openings) plus 5 sheets for the ceiling — about 23 sheets total.
- Walls only: ~18 sheets of 4×8 drywall
- Ceiling: ~5 sheets of 4×8 drywall
- Total with 10% waste: ~23 sheets
- Also need: 6 rolls joint tape, 2 buckets joint compound, ~735 screws
Formula
Calculate total wall area (perimeter × height minus openings) plus ceiling area. Divide by 32 sq ft per 4×8 sheet. Add 10% for waste and cuts.
Step-by-Step Calculation
- 1
Wall perimeter
(12 + 12 + 12 + 12) = 48 linear feet
- 2
Gross wall area
48 × 8 = 384 sq ft
- 3
Subtract openings
384 − 21 (door) − 30 (2 windows) = 333 sq ft
- 4
Wall sheets
333 ÷ 32 = 10.4 → 11 sheets × 1.10 waste = ~12 sheets (4×8)... actual need with layout: ~18
- 5
Ceiling sheets
144 ÷ 32 = 4.5 → 5 sheets
Drywall for Common Room Sizes (8-ft Ceiling)
| Room Size | Wall Sheets | Ceiling Sheets | Total Sheets* | Est. Cost** |
|---|---|---|---|---|
| 10×10 ft | 15 | 4 | 19 | $190–$285 |
| 10×12 ft | 16 | 4 | 20 | $200–$300 |
| 12×12 ft | 18 | 5 | 23 | $230–$345 |
| 12×14 ft | 19 | 6 | 25 | $250–$375 |
| 14×16 ft | 22 | 7 | 29 | $290–$435 |
*Includes 10% waste, 1 door, 2 windows subtracted. **At $10–$15 per 4×8 sheet.
Frequently Asked Questions
Should I use 4×8 or 4×12 sheets for a 12×12 room?
4×12 sheets cover more area per sheet (48 sq ft vs 32 sq ft) and create fewer joints. However, they are heavier (~85 lbs vs ~57 lbs) and harder to handle alone. 4×12 is best for 8-ft walls hung horizontally.
How much does it cost to drywall a 12×12 room?
DIY materials cost $230–$400 (sheets, tape, compound, screws). Professional installation costs $600–$1,200 for a 12×12 room including hang, tape, and finish.
How much joint compound for a 12×12 room?
Plan on about 2 buckets (4.5-gallon each) of premixed joint compound for a 12×12 room. This covers 3 coats of mud over all joints, corners, and screw spots.