How do I calculate drywall sheets for walls and a ceiling?
Surface area = wall perimeter × height − openings + optional ceiling. Sheets = adjusted area ÷ sheet area, rounded up.
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Drywall calculator
Calculate drywall sheets, tape, and compound for walls and ceilings.
- Metric and imperial units
- Instant updates as inputs change
- Data is calculated in this browser only
Results are planning estimates. Confirm site dimensions, product specifications, and installation waste before purchasing.
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Calculation notes
Understand the Drywall calculator
Wall area comes from room perimeter × height, less openings; ceiling area is added when selected. Net area plus waste is divided by sheet coverage and rounded up.
How many 4 by 8 ft drywall sheets are needed for a 12 by 10 ft room?
A 12 × 10 ft room with 8 ft walls and a ceiling has 472 sq ft before openings. With 10% waste and 4 × 8 ft sheets, it needs about 17 sheets before deducting doors and windows.
Can longer drywall sheets reduce seams and material waste?
- Compare layouts using 8-, 10-, or 12-ft sheets to reduce seams.
- Estimate moisture- or fire-rated board separately by room.
What framing and layout details can change drywall quantity?
- Irregular walls, offcuts, and many openings may require more waste.
- Sheet dimensions, tape, and compound needs depend on locally available products.
- Sheet orientation, framing layout, cutouts, damaged edges, and local code affect the order.
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