Calculators
Joint compound, tape and corner bead calculators
Compound by finish level, tape rolls, corner bead, skim coats, textures, sanding and mixing ratios.
Finishing is where the bucket count goes wrong, because "how much mud" has no answer until you say which level of finish you want. The Gypsum Association defines six levels, from bare board (Level 0) to a skim-coated wall ready for gloss paint under raking light (Level 5), and each level adds a coat. These calculators start from the level, apply the manufacturers' coverage figures per 1,000 sq ft of board, and round up to the pails or bags you will carry home.
Tape, corner bead, sanding abrasives and texture are counted the same way: from the length of joint, the number and height of corners, and the area of wall, with the waste that each material actually produces.
8 calculators
Joint Compound Calculator
Pails or bags of joint compound by finish level and compound type, pass by pass, from the sheets or the area of board.
Drywall Tape Calculator
Feet of joint and rolls of paper or mesh tape from the sheets you hang and the inside corners of the room.
Corner Bead Calculator
Pieces of metal, vinyl or paper-faced corner bead for outside corners, window returns and soffit edges, with the fasteners.
Finish Level Planner
What a finish level from 0 to 5 involves for your walls: the passes, the compound, the days, and whether it suits your paint and light.
Skim Coat Calculator
Compound for a skim coat from the area, the job (a Level 5 film or covering old texture) and the coats, in pails or cartons.
Drywall Texture Calculator
Bags or boxes of orange peel, knockdown, popcorn or hand texture for a ceiling or walls, light to heavy.
Sanding Sheets & Screens Calculator
Sanding screens, sheets, sponges or discs for the finish level and compound, the grits, and the masks to go with them.
Setting Compound Mixing Calculator
Water for a batch of setting-type joint compound, its working and set time, and how many bags and batches a job takes.
Guides for this topic
Bathroom and kitchen drywall: where moisture board goes, and where not
Green board is for splash and steam, not for water. Knowing where the line falls between gypsum and tile backer is most of what there is to bathroom drywall.
How long joint compound takes to dry, coat by coat
Twenty-four hours between coats is true at 70 °F and 70% humidity. In a cold basement it can be five days; in a warm, dry room, an afternoon.
Drywall repairs: patch kits, California patches, or a new section
The size of the hole decides the repair. A nail hole takes a fingertip of spackle; a fist hole takes a patch; a water-stained ceiling takes a saw.
Drywall textures: orange peel, knockdown, popcorn, and how much material
A texture hides small flaws and changes how a room looks and sounds. Each one has its own material, tools and coverage, and old ones come with a warning.
Drywall vs veneer plaster: cost, time and finish
Veneer plaster is the modern plaster: hard, smooth and decorated the day after it goes on. It costs more than drywall, and here is how much more.
Joint compound: all-purpose, lightweight, setting, and gallons per sheet
One bucket per ten sheets is the rule everyone quotes and nobody can source. Here is what the makers publish, and how the finish level changes it.
Levels of drywall finish, 0 to 5, explained
When a contractor quotes "taped and finished", ask which level. The answer decides how the walls look under paint, and a fair part of the price.
Paper vs mesh tape: strength, speed and where each belongs
Mesh is quicker to put on and paper is stronger once it is on. The right answer depends on the joint, and on the compound you bed it in.
Sanding drywall: grits, tools and keeping the dust down
Sanding is the messiest hour of the job and the one that decides how the paint looks. Less of it, done with the right grit and tool, is the goal.
Questions people ask
- How much joint compound do I need per sheet of drywall?
- USG's published coverage for complete finishing is 9.4 gallons of ready-mixed compound per 1,000 sq ft of board, which is 0.30 gallons per 4 × 8 sheet or one 4.5 gallon pail for every 15 sheets at Level 4. Tape and one coat (Level 2) needs less than half of that; a Level 5 skim coat adds about half a pail per 100 sq ft on top.
- Paper tape or mesh tape?
- Paper tape is stronger across the joint and folds cleanly into inside corners; it is the right choice for all flat joints and corners with all-purpose or setting compound. Fibreglass mesh tape is faster to put up and self-adhesive, but it must be embedded in setting-type compound and is best kept to small repairs and flat joints.
- How many pieces of corner bead do I need?
- One piece per outside corner, cut to the corner height, plus pieces for any soffit, bulkhead or window return corners. Bead comes in 8 ft and 10 ft lengths; a 9 ft corner takes a 10 ft piece, and short pieces from offcuts can cover window returns. Count every outside corner in the room, including the ones around a closet or a boxed duct.
- How much compound does a skim coat take?
- A thin skim coat over the whole wall, the step that turns a Level 4 finish into Level 5, uses about 0.45 gallons per 100 sq ft, or one 4.5 gallon pail per 1,000 sq ft. Two coats, or a thicker coat to flatten an old textured wall, doubles that.
- How much texture material per square foot?
- Sprayed orange peel and knockdown use roughly 1 gallon of thinned compound per 100 to 150 sq ft; a hand-troweled texture uses two to three times as much; popcorn ceiling texture comes dry and covers about 150 to 200 sq ft per bag at a medium thickness. The texture calculator takes the texture type and the application method.
More calculators on our other sites
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How much tile, wood, vinyl, carpet, underlayment and trim a floor needs, and what it costs.
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How much paint, primer, stain and wallpaper a job needs, and what it costs.
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Shingles, pitch, rafters, metal panels, gutters, ventilation and what a new roof costs.