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Drywall Calculation

Estimate drywall sheets from room size, openings and panel dimensions.

Calculation mode

Room dimensions
Doors and windows
Special areas

With sloped walls, measure room height only to the triangle base; add the top triangles here.

Panels and waste

Panel size

About 10% is typical for cuts, waste and spare sheets.

How is it calculated?

Drywall (gypsum board / plasterboard / sheetrock) is a gypsum core between paper faces. The estimator finds net wall (and optional ceiling) area, subtracts doors/windows, divides by panel area and adds waste.

Steps

  1. Enter room length, width and height; choose whether to include the ceiling.
  2. Enter door and window counts and sizes; those areas are subtracted.
  3. For sloped-wall triangles, add base, height and count (area = base × height / 2).
  4. Pick a panel size. Larger sheets cover more but are harder to handle.
  5. Keep about 10% waste for cuts and spare; read the rounded-up sheet count.

Common panel sizes

Metric sizes often include 1200×2000, 1200×2500, 1200×2600 and 1200×3000 mm. In the US, 4×8 ft (~1220×2440 mm) is common. Thinner boards suit curves/ceiling rehab; ~12.5 mm is standard for walls; thicker boards help sound/fire performance.

Drywall types (summary)

Regular; moisture-resistant (greenboard); mold/moisture-resistant (blueboard); soundproof; fire-resistant (Type X / C). Do not use standard drywall in wet rooms—use moisture-rated board, cement board or tile.