Drywall Calculator
The Drywall Calculator estimates the number of standard 4×8 ft drywall sheets needed for a room, with the option to include the ceiling and a waste allowance for cuts.
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How This Tool Works
Enter your room's length, width, and wall height. Optionally include the ceiling, and adjust the waste factor for your cutting needs.
Formula & Method
Wall area = room perimeter × wall height. If including the ceiling, add room length × width. Sheets needed = (total area × (1 + waste%)) ÷ 32 sq ft per standard 4×8 sheet.
Example Calculation
A 12×10 ft room with 8 ft walls (352 sq ft of wall) plus a 120 sq ft ceiling totals 472 sq ft. With 10% waste, that's about 17 sheets of drywall.
Frequently Asked Questions
What size are standard drywall sheets?+
Most residential drywall sheets are 4×8 ft (32 sq ft), though 4×12 ft sheets are also common for larger walls with fewer seams.
Should I subtract doors and windows?+
For a quick estimate, skip small deductions since offcuts are often reused elsewhere. For precise ordering on a large job, measure openings and subtract their area.
Do I need different drywall for ceilings?+
Ceilings often use slightly thicker or sag-resistant drywall, especially over long spans — check your local building code and joist spacing.
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