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Drywall Calculator

Drywall sheets cover a fixed area, so the number of sheets depends on total wall area and sheet dimensions. This calculator estimates the count with options to round up for waste.

What Is Drywall?

Drywall is a panel of gypsum plaster sandwiched between paper facings, used for walls and ceilings. The number of sheets needed is wall area divided by sheet area. Rounding up accounts for cutting waste and offcuts around openings.

Formula: Wall area / Sheet area

Example

Formula: Wall area / Sheet area
= 50 m² / (2.4 m x 1.2 m)
= 17.36 sheets
≈ 18 sheets (rounded up)

Enter wall area and sheet size units, then choose result type (rounded or exact).

Tip: Choose result type (rounded or exact) on the right before calculating.

Rounded up is recommended for waste and cuts.

Step-by-step calculation

  1. Enter wall area and sheet size with units.
  2. Select result type (rounded or exact).
  3. Calculate to see sheet count and steps for that mode.

How this is calculated

Sheet count = finished wall or ceiling area divided by standard sheet area (commonly 1.2 m by 2.4 m = 2.88 m²), plus 5–10% for cuts, joints, and offcuts.

Sources: ASTM C1396 (Gypsum Board); IS 2095 (Gypsum Plaster Board).

FAQ

How do I calculate drywall sheets by hand?
Divide wall area by sheet area. Example: 50 m² / (2.4 x 1.2 m) = 17.36, round up to 18.
What is the formula for drywall count?
Sheets = Wall area / Sheet area. Use rounded up for purchasing.
Standard sheet vs custom sheet
Standard sheets are 1.2 x 2.4 m. Custom sizes change the sheet area calculation.
What units should I use?
Use m² for wall area and meters for sheet dimensions.
Can I use this for ceiling?
Yes. Enter ceiling area instead of wall area for ceiling drywall estimates.

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