How this calculator works
Drywall comes in standard sheets: 1200×2400 mm (2.88 m²), 1200×2700 mm (3.24 m²), or 1200×3000 mm (3.6 m²). Divide total area by sheet area, add 10% wastage, and round up.
For every sheet, budget: 32 drywall screws (1¼"), 4 m joint tape, 1 m² joint compound.