What is the standard drywall size?

Most common is 1200×2600 mm (3.12 m²); 1200×3000 mm is also used.

How much drywall waste?

About 10%, more around openings like doors and windows.

Drywall Calculator

Calculate how many drywall sheets you need from wall or ceiling area. Includes 10% waste.

Area: 40 m²

Sheet size: 3.12 m²

15 pcs

Sheets needed

Area	40 m²
+10% waste	44.0 m²
Sheets	15 pcs

ℹ️ Standard sheet 1200×2600 mm = 3.12 m². Check your sheet size.

This drywall calculator estimates how many sheets you need to cover a wall or ceiling. Enter the area to be boarded and the size of one sheet to get the number of sheets with waste included.

How the calculator works and what it’s for▾

How the calculation is done

The tool divides the area by the area of a single sheet and rounds up to whole sheets. A 10% waste margin is added to the area, because sheets have to be cut and fitted around openings.

If you board 30 m² of wall and a sheet is about 3 m², you will need roughly eleven sheets once waste is counted.

Inputs and results

The fields are the area in square metres and the sheet size in square metres. The result shows the area, the area increased by the 10% waste, and the number of sheets required.

The sheet count is rounded up, so it is ready to use when placing an order.

Who it is for

It is handy for interior renovations when you build partition walls or board a ceiling. It helps you order enough at once without a large surplus.

Good to know about sheet size

A standard sheet of 1200 × 2600 mm equals 3.12 m². Still, check your own sheet size, since other dimensions exist and the sheet size directly affects how many pieces you need.

🔄 Reviewed June 2026