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Drywall & Finishing Calculator

Count sheets, screws, joint compound and tape for a room, minus openings.

The room
ft
ft
ft
Board and framing

Longer sheets mean fewer butt joints, and butt joints are the hardest seams to hide.

Framing spacing
Openings and corners

Each one needs corner bead the full height. A plain rectangular room has none.

%
Pricing
$
$

4.5 gallon ready-mix pail.

Openings are only deducted once an individual opening passes 20 square feet. That is standard estimating practice, not an oversight: the board cut out of a small opening is scrap, the cuts around it take more labor than a full sheet, and deducting a standard door or window would leave you short.

Sheets to order

144 × 12 sheets

584 sq ft of board plus 10% waste, divided by 48 sq ft per sheet.
Board area416 sq ft walls + 168 sq ft ceiling
584 sq ft
Board and compound costScrews, tape and bead are not priced here
$242
Screws32 per sheet at 16" OC — about 1.4 lb
448
Joint compound1 pail at 4.5 gal, three-coat Level 4 allowance
4.4 gal
Joint tape1 roll of 250 ft paper tape
216 lf
Corner bead2 sticks at 8 ft
16 lf

No openings were deducted

Every opening you entered is at or under 20 square feet, so none came off the total. That is correct estimating practice. Deducting a standard door would leave you a sheet short on a room this size.
Full material list
ItemQuantityBasisCost
Drywall, 4 × 1214 sheets642 sq ft with waste ÷ 48 sq ft$224
Drywall screws, 1-1/4 in448 screws32 per sheet at 16 in OC—
Joint compound, all purpose4.4 gal — 1 pail600 sq ft per 4.5 gal pail, taping plus two coats$18
Paper joint tape216 lf — 1 roll0.37 lf per sq ft of board—
Metal corner bead16 lf — 2 sticks2 corners × 8.0 ft—
Priced items14 sheets + 1 pails$242
Surface by surface
SurfaceDimensionsArea
Wall — length side14.0 × 8.0 ft112.0 sq ft
Wall — length side (opposite)14.0 × 8.0 ft112.0 sq ft
Wall — width side12.0 × 8.0 ft96.0 sq ft
Wall — width side (opposite)12.0 × 8.0 ft96.0 sq ft
Ceiling14.0 × 12.0 ft168.0 sq ft
Openings deductedNone over the threshold−0.0 sq ft
Net board areaPlus 10% waste642.4 sq ft

Buy compound short, not long

How much compound a job actually takes varies more than any other line here — it depends on how much you sand back off, whether you are skimming butt joints, and how flat the framing is. The 1 pail above is the middle of the published coverage band, so treat it as the likely number rather than the safe one. Buy that much, start the job, and get more once you can see how it is going rather than stocking up front. Compound is sold everywhere and does not keep well once a pail has been opened.

Level 4 is the residential standard and is what this estimate assumes: tape coat, two fill coats, and the fastener heads spotted. Level 5 adds a skim coat over the entire surface and is worth specifying for a wall in raking light or under gloss paint, where every seam telegraphs. A Level 5 finish adds roughly half again to the compound.

What this assumes

  • Openings smaller than 20 square feet are not deducted, matching standard estimating practice.
  • Screw count assumes roughly 32 screws per 4×8 sheet at 16 inch framing.
  • Compound estimate assumes a three-coat finish to a Level 4 surface.

Understanding the result

Sheet length changes the job

Twelve-foot sheets eliminate butt joints in most rooms, and butt joints are the hardest seams to hide. If the material can physically get into the room, longer sheets produce a noticeably better finish with less compound and less sanding.

Finish levels

Level 4 is the residential standard and is what most estimates assume. Level 5 adds a skim coat over the entire surface and is worth specifying for walls with raking light or a gloss paint, where every seam would otherwise telegraph.

Ceiling versus wall compound

Ceilings need more joint compound per square foot because butt joints and screw heads are harder to hide overhead. Budget 15 to 20% more compound for ceilings than walls in the same room. Lightweight compound reduces arm fatigue on ceiling work.

Moisture-resistant board in wet areas

Greenboard or cement board is required on walls in shower and tub surrounds — not standard drywall. Cement board adds cost and weight but is mandatory behind tile in wet locations. Use moisture-resistant board on bathroom walls outside the wet zone.

Common questions

How many sheets of drywall for a 12x12 room?
A 12×12 room with 8-foot ceilings has 384 square feet of wall surface (four walls × 12 × 8) plus 144 square feet of ceiling, totaling 528 square feet. At 32 square feet per 4×8 sheet, you need 17 sheets before waste. With 10% waste, order 18 sheets.
How much drywall for a 1000 sq ft house?
A 1,000 square foot single-story house typically needs 150 to 200 sheets of 4×8 drywall depending on layout, ceiling height, and whether garages and closets are finished. That is 4,800 to 6,400 square feet of surface area. Budget 10% waste on top.
How many screws per sheet of drywall?
Standard practice is 32 screws per 4×8 sheet on walls — one every 12 inches on ceiling joists or studs in the field and every 8 inches along edges. Ceilings need screws every 8 inches in the field. A 20-sheet room needs roughly 640 screws.
How much joint compound per sheet?
A three-coat Level 4 finish uses roughly 0.5 to 0.7 gallons of ready-mix compound per 4×8 sheet. Twenty sheets need 10 to 14 gallons. All-purpose compound works for all three coats; topping compound on the final coat sands easier.
How much drywall tape per room?
Paper tape at seams uses roughly 1 linear foot per square foot of drywall installed. A 12×12 room with 528 square feet of surface needs about 500 feet of tape — roughly 2 rolls of 250-foot paper tape. Mesh tape is used only for patches, not full seams.
Should I use 1/2 or 5/8 inch drywall?
Use 1/2 inch on walls and on ceilings with joists 16 inches on center. Use 5/8 inch type X on ceilings with joists 24 inches on center and on fire-rated walls between garages and living space. Five-eighths inch is heavier and harder to hang overhead.
How many sheets of drywall for a 10x10 room?
A 10×10 room with 8-foot ceilings: 320 square feet of walls plus 100 square feet of ceiling = 420 square feet. That is 14 sheets at 32 square feet each, plus 10% waste = 15 sheets. Use 12-foot sheets on 8-foot walls to eliminate butt joints.
How much does drywall cost per sheet?
Standard 1/2 inch 4×8 drywall runs $12 to $18 per sheet at retail. Five-eighths inch type X runs $15 to $22. Moisture-resistant greenboard runs $14 to $20. A 15-sheet room costs $180 to $270 in board alone before compound, tape, and screws.
Do you deduct windows and doors from drywall?
Openings smaller than 20 square feet are typically not deducted in estimating — the waste from cuts around openings roughly equals the material saved. Large openings over 20 square feet (patio doors, picture windows) are deducted. This matches standard contractor estimating practice.
How long does it take to hang drywall?
An experienced two-person crew hangs 30 to 40 sheets per day including taping the first coat. A 15-sheet room takes one crew roughly half a day to hang and one full day for three coats of mud and sanding. DIY takes two to three times longer.

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