Formula
One sheet’s area is its length times its width, in metres.
Sheets are the wall area times one plus waste, divided by the sheet area, then rounded up.
Worked example
20 m² with 10% waste, on 2400 × 1200 mm sheets (2.88 m²), is 7.6 sheets, rounded up to 8.
Screws, joint tape and compound are not counted.
Assumptions
Both countries start on 2400 × 1200 mm, which is 2.88 m². Waste starts at 10%.
Australia also lists 2700 × 1200 mm and 3000 × 1200 mm. The UK also lists 1800 × 900 mm.
Screws, joint tape and compound are not counted.
Checked
Checked 10 November 2026. British Gypsum lists Gyproc WallBoard at 1800 × 900 mm and 2400 × 1200 mm, and Travis Perkins sells those sheets. Bunnings lists Gyprock at 2400 × 1200 mm, with 2700 × 1200 mm and 3000 × 1200 mm among the options.