Drywall sheet calculator
Choose walls or ceiling, enter the dimensions of the room and the size of the sheets you will use. The calculator returns the area to cover and the number of whole sheets.
For walls, subtract the area of doors and windows in the optional openings field. Add a waste allowance if you want extra sheets for cuts; leave it empty for none.
Area to cover 332 sq ft Area to order 332 sq ft Whole sheets 11
Method and limitations
Walls: area = 2 × (length + width) × height − area of the openings. Ceiling: area = length × width. Area to order = area × (1 + waste ÷ 100), where the waste allowance is the percentage you type, and 0% when the field is empty. Sheets = area to order ÷ (sheet length × sheet width), rounded up to a whole sheet. The sheet size is pre-filled with the most common format, 8 × 4 ft (2.5 × 1.2 m), and you can change it to match the sheets you buy. The result is a surface count: the layout of the joints, the direction of the sheets, remaining offcuts, trim and the thickness of the board are not computed. This is a geometric calculation, so no external source is needed.
Sources
No external reference is documented for this calculation; its method and limitations are described above.
