Calculate drywall sheets, joint compound, tape, and fasteners needed for walls and ceilings.
Last updated: March 2026
feet
feet
feet
standard sheet
add ceiling area
typical: 10%
⚠ Rough Estimates: This calculator provides preliminary material estimates. Actual requirements vary significantly based on:
Drywall (also called gypsum board, plasterboard, or sheetrock) is a layer of gypsum plaster pressed between two sheets of paper, used to create interior wall and ceiling surfaces. Standard drywall sheets come in 4 feet wide × 8, 10, or 12 feet long, with thickness options of ½" (standard), ⅝" (fire-resistant), or ¼" (curved applications). Drywall is fastened to framing studs with drywall screws, then finished with joint compound (mud) and tape.
Finishing drywall involves taping and mudding all seams, corner beads on outside corners, and covering screw heads. Multiple coats of compound are lightly sanded between applications for a smooth, paintable surface. Accurate material estimation prevents shortages or excessive waste, optimizing project budgets and timelines.
Estimate drywall for 12 ft × 10 ft room with 8 ft ceiling, including ceiling, 10% waste:
½" drywall is standard and lighter, used for most walls. ⅝" is thicker, fire-resistant, and better for soundproofing but heavier. Use fire-rated drywall in garages, basements, or near furnaces.
4×8 is standard and easiest to handle alone. 4×10 and 4×12 cover more area with fewer seams but are heavier (5-8 lbs heavier per sheet). Choose based on ceiling height and crew strength.
Waste accounts for cuts around doors/windows, imperfect seams, and mistakes. 10% is typical for rectangular rooms; 15-20% for complex layouts. Never skimp—you'll regret running short.
Tape seams, apply 1st coat of compound, light sand, apply 2nd coat, sand, apply final coat, sand smooth. Use 6", 10", and 12" knives for progressively wider coverage. Sand between coats for seamless finish.
1¼" coarse-threaded drywall screws (25-32 gauge) are standard for 16" on-center framing. Space screws 12" apart on first pass, 16" on ceilings. Pre-drilling reduces fractures in existing board.
Yes for horizontal application, but it's tough above your head. Drywall lifts or racks help. For ceilings, t-braces or lifts are almost essential. Have a helper for fastest, safest installation.
Yes. Fresh drywall joint compound absorbs paint unevenly, creating blotchy finishes. Use drywall primer (or all-in-one paint+primer) for uniform coverage. Skip primer only if repainting existing wall.
At least 3-5 days with drying time between coats. First coat dries 12-24 hours, second 24 hours, final 24 hours. Total labor: 1-2 days for a 400 sq ft room, plus drying + sanding time.
Related Tools
Calculate countertop area.
Calculate cabinet door sizes.
Calculate crown molding angles.
Calculate window blind sizes.
Calculate insulation needed.
Calculate concrete needed.