Drywall Calculator: Sheets, Mud, Tape, Screws & Board Area
Room dimensions become drywall sheets, joint compound, tape, and screws for walls and ceiling — cutouts fold into the waste margin, not deducted.
sheets = ceil(581 ÷ 32) = 19
How it works
Drywall starts with board area. The walls are the room perimeter times the ceiling height, and the ceiling adds length times width. Openings around doors and windows are counted as board, not deducted — you hang the full sheet and cut the hole out afterward, and the cut piece is waste. Add about 10 % for that waste plus breakage, then divide by the sheet size to get sheets. A 4 × 8 sheet is 32 sq ft; a 4 × 12 is 48 sq ft.
The finishing materials scale with the board area. Using the USG estimating figures, plan on about 0.14 lb of ready-mix joint compound per square foot for a tape-and-three-coat finish, roughly 0.37 linear feet of joint tape per square foot, and about one drywall screw per square foot at the standard 12"/16" fastening spacing.
Fewer, larger sheets mean fewer joints to tape, which is faster and looks better — but 4 × 12 sheets are heavy and hard to maneuver in tight rooms. Sheets, compound, and screws all round up to whole purchasable units.
walls = (2 × (12 + 12)) × 8 = 384 sq ft · ceiling = 144 sq ft → board = 528 sq ft
sheets = 528 × 1.10 ÷ 32 = 18.15 → 19 sheets
compound ≈ 74 lb · tape ≈ 195 ft · screws ≈ 528