Miscellaneous

Drywall Calculator - Sheets, Screws & Joint Compound

Calculate drywall sheets, screws, tape, and joint compound needed for a room or multiple rooms. Accounts for doors and windows.

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Room 1

Width (ft)

Length (ft)

Height (ft)

Doors

Windows

Wall Sq Ft

351

Ceiling Sq Ft

144

4×8 Sheets

Includes 10% waste factor. Buy extra for cuts and mistakes.

Standard drywall sizes

4×8 ft sheets: most common; 32 sq ft per sheet.
4×12 ft sheets: fewer seams for taller walls; 48 sq ft per sheet.
Thickness: 1/2" (standard walls/ceilings), 5/8" (fire-rated, garage/basement), 1/4" (curved surfaces).

Coverage estimate

Calculate total wall area, subtract openings (doors ~20 sq ft, windows ~15 sq ft each), then add a 10–15% waste factor for cuts and mistakes. Divide by 32 (sheet sq ft) to get sheet count. Round up to the next whole number.

Materials per 100 sq ft of drywall

~4 lbs of drywall screws (1-5/8" for 1/2" drywall)
~200 ft of joint tape
~1 gallon of joint compound (all-purpose)