Drywall Calculator

Drywall is priced and delivered by the sheet, and every hanger and finisher plans their day by the sheet count. The most common residential sheet is 4 feet wide by 8 feet long, which covers exactly 32 square feet. Ten-foot and twelve-foot sheets are common in commercial work and in residential ceilings where the longer sheet reduces the number of joints you have to tape and finish.

The math is simple: total wall and ceiling area in square feet, divided by the coverage of one sheet, times a waste factor. For a 12 by 15 foot room with 8 foot ceilings, the four walls are (2 x 12 + 2 x 15) x 8 = 432 square feet, and the ceiling is 12 x 15 = 180 square feet, for a total of 612 square feet. Divided by 32, that is 19.1 sheets. Add ten percent waste and order 22 sheets of 4x8.

For any long ceiling run, 4x12 sheets almost always beat 4x8 sheets because there are fewer butt joints to float. A butt joint is the toughest joint in the trade to make invisible, and skipping half of them by using longer sheets buys you real time in the finish stage.

Drywall screws are sold by the pound, and one pound is roughly 250 to 320 screws depending on length. Plan on 32 screws per 100 square feet of drywall for walls, 40 to 48 screws per 100 square feet for ceilings. A 5-pound box of 1-1/4 inch coarse-thread drywall screws covers a couple thousand square feet of typical residential work.

Joint tape comes in paper and mesh. Paper tape is the standard for flat joints because it does not stretch and gives a tighter finish. Fiberglass mesh tape is preferred for repairs and for hot-mud fast-set applications. Plan on about one linear foot of tape per 3 square feet of drywall for a typical residential room.

Joint compound, called mud in the trade, is sold in 4.5 gallon buckets that weigh about 60 pounds. One bucket covers roughly 500 square feet through the three-coat process of tape, block, and skim. On a 1,500 square foot house with typical fenestration, plan on eight to ten buckets. If you are running a Level 5 finish, add two more buckets for the final skim.

Corner bead comes in metal and vinyl. Metal is faster to install with a stapler or crimper, vinyl is more forgiving on out-of-square corners. Estimate corner bead by counting the outside corners in the plan and multiplying by the ceiling height plus about six inches for cut waste per corner.

The default wall thickness in residential work is 1/2 inch regular drywall. The 1/2 inch board is fire-tested at 15 minutes and is stiff enough to span standard 16-inch stud spacing without visible sag between fasteners.

5/8 inch Type X drywall is the standard for garage walls that share a wall with living space, for stairwells, for utility rooms with a furnace or water heater, and for one-hour fire-rated assemblies. Any wall or ceiling separating a garage from a house needs 5/8 inch Type X in most jurisdictions.

Moisture-resistant board, often called "green board," belongs in bathroom walls that are not directly behind a tile installation. For anything behind tile in a wet area, use cement backer board or a modern water-resistant tile substrate; green board is not a tile substrate on its own.

Ceilings that will get textured with a heavy stipple or knockdown texture perform better in 5/8 inch board because the extra thickness resists sag between joists. Any ceiling framed at 24-inch on center joist spacing should be 5/8 inch board, not 1/2 inch.

A two-person crew can hang about 40 to 60 sheets of 4x8 drywall in a day on a straightforward residential job. A skilled solo hanger with a drywall lift can do 30 to 40 sheets a day on ceilings and 40 to 50 on walls. Ceilings first, then walls, is the sequence that gives the tightest inside corners.

The finish schedule runs across three or four working days. Day one: tape the joints and the inside corners with the first coat of compound and let it dry overnight. Day two: apply the second, wider block coat. Day three: apply the final skim coat and sand the whole surface. Day four: final touch-up sanding and dust cleanup.

Texture goes on after all mud has dried and been sanded. Orange peel, knockdown, and skip trowel are the common Texas residential textures. Smooth Level 5 finishes are the emerging premium in high-end residential work and add a full labor day for the priming and final skim.

Interior finish work is a search-driven trade in 2026. Homeowners doing a remodel or dealing with water damage type "drywall contractor near me" and hire whoever answers first. Peak Local Leads builds and ranks local drywall and interior finish sites for one contractor per Texas market. Seven day free trial on the calls, flat monthly after, no per-lead fees. Ask us if your area is open.