CalcCoverageHow many sheets of drywall do I need?
Drywall is counted in sheets, and sheets are counted by area: add up the wall area (perimeter × ceiling height), add the ceiling if you are boarding it, and divide by the area of one sheet. Bigger sheets mean fewer joints to tape and finish, which is why pros reach for 12 ft sheets on long walls.
Sheets = wall area (with waste) ÷ sheet area · A 4 × 8 ft sheet covers 32 sq ft
Example: a 12 × 10 ft room with 8 ft ceilings has 2 × (12 + 10) × 8 = 352 sq ft of wall. In 4 × 8 ft sheets that is exactly 11 sheets — 13 sheets with the 10% waste allowance for cuts around doors, windows and corners.
Screws, tape and mud — the finish count
| Material | Planning rule used here |
|---|---|
| Screws | About 32 per 4 × 8 sheet (edges + field), ≈190 screws per lb |
| Joint tape | Sheet width + sheet length of tape per sheet (joints are shared between neighbours) |
| Joint compound | About 1 gallon of ready-mix per 100 sq ft for taping, two finish coats and screw heads |
These are the standard planning figures. A first-time finisher uses more mud, not less — it sands off, and running out mid-coat is worse than a leftover half bucket. Keep the compound figure as a minimum, not a target.