Drywall Calculator
Enter the area you're covering and your sheet size to get a sheet count, plus the tape, mud, and screws that go with it.
Sheets needed
18 sheets
Joint compound
4.5 gal
Joint tape
175 ft
Drywall screws
625
At the defaults above (500 sq ft, 10% waste, 4x8 sheets) that's 18 sheets, 4.5 gallons of joint compound, 175 feet of tape, and 625 screws.
How it's calculated
Sheet count comes from your area plus waste, divided by the chosen sheet's square footage and rounded up. Compound, tape, and screws all scale linearly with area using the same per-100-sq-ft rates manufacturers publish in their own installation guides -- see StoneCalc's drywall mud calculator for a bucket-size (4.5 gal / 3.5 gal / 1 gal) breakdown of the compound specifically.
Keep going
- Once the drywall is hung, taped, and sanded, the paint calculator sizes primer and topcoat gallons for the same wall area. Paint Calculator
- Trim goes up after drywall, not before; the baseboard calculator sizes it from the same room's perimeter. Baseboard Calculator
Frequently Asked Questions
Which sheet size should I pick?
4x8 sheets are the standard for most residential walls and are the easiest for one person to handle. 4x10 and 4x12 sheets cover more area per sheet (fewer joints to tape) but are heavier and need a second person or a lift for ceilings and tall walls.
Why 10% waste?
10% is the standard sheet-goods estimating default -- it covers off-cuts around outlets, doors, and windows, plus the occasional damaged sheet, without over-ordering by much on a straightforward room.
How much joint compound do I actually need per 100 sq ft?
This calculator uses the commonly published figure of about 0.9 gallons of compound, 35 feet of joint tape, and 125 screws per 100 sq ft of drywall for a standard three-coat tape-and-finish job -- the same source-class figures StoneCalc's own drywall mud calculator uses for a bucket-size breakdown.
Do I need joint tape and mud as separate purchases?
Yes -- paper or mesh tape reinforces the seam itself, and joint compound (mud) is applied over and around it in multiple coats. Skipping tape and relying on mud alone leads to seams cracking as the house settles.
What if I'm doing a full skim coat, not just taping seams?
A skim coat over the whole surface uses meaningfully more compound than the standard tape-and-finish figures here, which only cover seams and fastener heads -- budget extra material if that's your plan.