Drywall Calculator - Sheets, Screws & Joint Compound

Miscellaneous

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.

How to use this tool

Enter room dimensions (width, length, ceiling height).
Specify number of doors and windows to subtract.
Read sheet count with 10% waste allowance included.

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)

Frequently asked questions

What size drywall sheet is standard?

The most common size is 4×8 ft (48×96 in). 4×12 ft sheets are also popular for tall ceilings as they reduce seams.

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