Drywall is easy to calculate but easy to underestimate – especially with lots of cuts around windows and pipes. Here's the quick method.
For 120 × 240 cm sheets (2.88 m² per sheet) you'll need one sheet per 2.9 m² of wall or ceiling. Add 10 % waste on top.
Sheets per m² = 1 ÷ sheet area in m². 120 × 240 cm = 2.88 m², so 0.35 sheets per m² – one sheet per 2.9 m².
If you're cladding both faces of a partition, multiply the wall area by 2.
10 % waste is normal. Lots of cuts around windows, doors and pipes? Plan for 15 %.
A 12 m² stud wall clad both sides = 24 m² total. With 120 × 240 cm sheets that's 24 ÷ 2.88 = 8.3 → 9 sheets. Add 10 % waste and you're at 10 sheets. Add 1 more if you've got a door in the wall.
Enter your wall area and sheet size – the calculator works out sheets and screws with waste included.
12.5 mm for most walls and ceilings. 15 mm for fire- or sound-rated walls (e.g. between flats).
Usually no. Walls with fire or sound ratings often need two layers – check the spec.
30–40 depending on sheet size and stud spacing. The calculator gives you an estimate.
No – use moisture-resistant or wet-room boards. Standard plasterboard softens and crumbles with repeated moisture.
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