Drywall Calculator

Estimating a drywall job

The core math is total surface area divided by the area of one sheet, times a waste factor for cuts and offcuts. Waste sits around 10 percent for straightforward rooms; complex framing, sloped ceilings, and lots of small cutouts push it toward 15 or 20 percent. Bigger sheets reduce the number of butt joints, which is the slowest part of finishing, but they are heavier and harder to move by yourself.

Finishing materials

A standard finish is tape plus three coats of joint compound: bed coat, block coat, and skim. Budget roughly 0.05 pounds of mud per square foot of drywall for that sequence. Paper tape handles flat seams and inside corners; corner bead handles outside corners. Sanding sponges and a good work light are what actually make the walls look flat.

Ceilings versus walls

Ceilings need more screws per sheet, more helpers, and a lift or T-brace to hold sheets up while you fasten them. Type X (5/8 in) is required by code on garage-to-house ceilings; regular 1/2 in is fine for most rooms.