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Calculate how many drywall sheets you need for walls and ceilings with sheet size recommendations.
Measure the length and height of each wall in feet. Multiply length × height for each wall, then add all walls together to get total wall area. Do not subtract windows and doors—the waste factor accounts for these openings.
If you are drywalling the ceiling, measure room length × width in feet. Add this to your wall area for total square footage. Remember: 5/8" drywall is recommended for ceilings when joists are 24" on center (building code requirement).
Select sheet size based on wall height. 4x8 sheets (32 sq ft) are standard for 8-foot walls. 4x10 sheets (40 sq ft) reduce seams for 9-10 foot walls. 4x12 sheets (48 sq ft) minimize seams for tall walls but are heavier and harder to handle alone.
Add 10-15% for cuts around openings, breakage during handling, and fitting adjustments. Complex room layouts or vaulted ceilings need higher waste factors. The calculator divides total area by sheet size, applies waste, and rounds up to whole sheets.
Total wall area to drywall
Add ceiling area if drywalling ceiling
Coverage: 32 sq ft per sheet
Get sheet size suggestion based on wall height
Typical: 5-15% for cuts and breakage
Enter price to calculate total cost
4' x 8' sheets (includes 10% waste)
Without waste factor
4' x 8'