How many sheets do I need for a 12 m² wall?

With standard sheets (1200 × 2400 mm) you need 12 ÷ 2.88 ≈ 4.17, rounded up to 5 sheets. Adding 10% waste brings it to 5–6 sheets.

Should I use 1 or 2 layers of drywall?

1 layer is enough for most internal walls and ceilings. 2 layers are required for fire resistance (per building codes), sound insulation between rooms, or where the wall needs to support heavy shelves and cabinets.

How much waste should I budget for with drywall?

Budget 10% waste for most walls and ceilings with normal cutouts. For walls with many outlets, pipes, angled walls or dormers, 15% is more realistic.

What sheet sizes are available?

Typical sizes: 900×2400 mm (2.16 m²), 1200×2400 mm (2.88 m² – standard), 1200×2700 mm (3.24 m²), and 1200×3000 mm (3.60 m²). Larger sheets reduce the number of joints and sanding work.

How many drywall sheets do you need per m²?

Q: How many drywall sheets do you need per m²?

A standard 1200 × 2400 mm drywall sheet covers 2.88 m², which equals about 0.35 sheets per m². In practice you always round up to whole sheets since half sheets aren't sold.

A standard drywall sheet measures 1200 × 2400 mm and covers 2.88 m². That means one sheet covers just under 3 m² of wall or ceiling.

900 × 2400 mm2.16 m²approx. 0.46 sheets/m²

1200 × 2400 mm2.88 m²approx. 0.35 sheets/m²

1200 × 2700 mm3.24 m²approx. 0.31 sheets/m²

1200 × 3000 mm3.60 m²approx. 0.28 sheets/m²

In practice you count in whole sheets and round up — you can't buy half a sheet.

Example: 12 m² wall

A wall measuring 4 × 3 metres gives 12 m². With standard drywall sheets (1200 × 2400 mm) the calculation looks like this:

Wall area4 × 3 = 12 m²

Sheet area1.2 × 2.4 = 2.88 m²

Sheets (raw)⌈12 ÷ 2.88⌉ = 5 sheets

With 10% wasteapprox. 5–6 sheets

Don't forget waste and cutting

Drywall sheets need to be cut around power outlets, windows, door frames and corners. The offcuts can rarely be reused completely, so there will always be waste.

•10% — most walls and ceilings with normal cutouts
•15% — many outlets, pipes, sloped walls or dormers

1 layer or 2 layers?

For most interior walls and ceilings, 1 layer of drywall is sufficient. However, there are situations where 2 layers are necessary:

•Fire protection — building codes may require 2 layers to achieve the necessary fire resistance
•Sound insulation — 2 layers of drywall significantly reduce sound transmission between rooms
•Extra strength — load-bearing walls for heavy shelves or cabinets

With 2 layers you simply double the number of sheets, screws and joint compound. The calculator handles this automatically.

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Use MyPlanDIY's free drywall calculator — choose sheet size, number of layers and waste, and get the exact number of sheets and screws.

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