Free drywall calculator to estimate sheets, joint compound, tape, screws, and total costs for walls and ceilings with waste allowance.
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Planning a drywall project? Our calculator helps you determine the exact number of drywall sheets plus all the supplies you'll need—joint tape, compound, and screws. Accounts for doors, windows, and waste to give you accurate material lists and cost estimates.
Drywall (sheetrock) comes in standard sheets: 4'×8', 4'×10', and 4'×12'. You need to calculate wall area, subtract openings, and add 10% for waste. Plus you'll need joint compound (mud), paper tape, and screws—all calculated based on the area covered.
Drywall Sheet Formula
Calculate drywall for new construction with multiple walls and openings.
Estimate materials for finishing an unfinished basement.
Calculate materials for patching or replacing damaged drywall sections.
Calculate exact sheet count needed
Determine tape and compound quantities
Account for windows and doors
Include waste factor automatically
Estimate total project cost
4'×8' is standard and easiest to handle. 4'×12' reduces seams for 8-foot walls. 4'×10' is good for 9-foot ceilings. Longer sheets mean fewer joints but harder to maneuver.
A 4.5-gallon (about 61.7 lb) bucket of all-purpose joint compound covers roughly 450 square feet of drywall for embedding tape plus three finish coats — about 0.14 lb per square foot. Plan on one bucket per ~450 sq ft and keep a little extra for the final skim coat.
Use 28-32 screws per 4'×8' sheet. Space screws 12 inches apart in the field and 8 inches at edges. Always screw into studs.
Horizontal is standard for walls—creates stronger joints and fewer seams. Vertical is used for ceilings and when sheets are tall enough to cover the wall.