Formula
Wall area = 2 x (length + width) x height - openings. Area with waste = wall area x (1 + waste percentage). Sheets needed = ceiling(area with waste / sheet area).
Wall board material estimator
Drywall Calculator
Estimate drywall sheet count, wall area, waste allowance, joint compound, screws, and material cost for room finishing or renovation projects.
Calculate drywall materials
Drywall area
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Sheets needed
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Joint compound estimate
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Screws estimate
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Example
A 12 ft by 10 ft room with 8 ft walls has 352 sq ft before openings. Subtract 40 sq ft for doors/windows, add waste, then divide by sheet area.
Useful for
Room remodels, basement finishing, drywall takeoffs, sheetrock ordering, and quick material planning.
Drywall estimate notes
This calculator estimates wall drywall only. Ceilings, closets, odd angles, double layers, fire-rated board, moisture-resistant board, and complex cutouts may change the material count.
FAQ
What sheet area should I enter?
A 4 x 8 sheet is 32 sq ft. A 4 x 12 sheet is 48 sq ft. Use the sheet size you plan to buy.
Does this include ceiling drywall?
No. For ceilings, add ceiling area manually or run a separate calculation using length x width.