Drywall Calculator: Sheets, Joint Compound, Tape and Screws
Enter the room and this calculator returns the sheets of drywall, the gallons of joint compound, the feet of tape and the screws — using the coverage rates the manufacturer publishes, not rules of thumb. It also gives you the weight, which is what decides whether that 12 ft sheet goes up two-handed or on a lift.
Sheets to order
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Results are estimates for planning purposes. Verify with your supplier, engineer, or a qualified professional before ordering material or performing work.
What a sheet weighs, by size and thickness
| Sheet | 1/4 in 1.2 lb/ft² | 3/8 in 1.4 lb/ft² | 1/2 in UltraLight 1.25 lb/ft² | 5/8 in Type X 2.2 lb/ft² |
|---|---|---|---|---|
| 4 × 8 ft (32 ft²) | 38 lb | 45 lb | 40 lb | 70 lb |
| 4 × 10 ft (40 ft²) | 48 lb | 56 lb | 50 lb | 88 lb |
| 4 × 12 ft (48 ft²) | 58 lb | 67 lb | 60 lb | 106 lb |
| 4 × 14 ft (56 ft²) | 67 lb | 78 lb | 70 lb | 123 lb |
| 4 × 16 ft (64 ft²) | 77 lb | 90 lb | 80 lb | 141 lb |
| 54 in × 12 ft (54 ft²) | 65 lb | 76 lb | 68 lb | 119 lb |
Sheet area times the nominal weight USG publishes for that panel. Weights are approximate by the manufacturer's own note — they are for design and shipping, and the actual panel varies by plant. Every figure in the 5/8 in column is a two-person lift on a ceiling, and most of that column is a lift worth planning rather than improvising.
Published coverage rates this calculator uses
| Material | Coverage per 1,000 ft² of panels | Packaging | Source |
|---|---|---|---|
| Sheetrock All Purpose joint compound | 10 gal | 4.5 gal pail, 3.5 or 4.5 gal carton | USG J1969 |
| Sheetrock Plus 3 lightweight compound | 9.4 gal | 3.5 or 4.5 gal carton, 4.5 gal pail | USG J498A |
| Sheetrock paper joint tape | 370 ft | 75, 250 and 500 ft rolls, 2 1/16 in wide | USG J1736 |
These are the manufacturer's published figures for a standard three-coat finish, not a level-5 skim. Skim coating the whole surface, a heavy texture, or a lot of inside corners will run past them — the compound line here is a purchase estimate, not a ration.
The part that is not about quantities
- Sanding joint compound makes respirable dust. USG's own caution on every one of these submittal sheets is to cut and trim with a utility knife or hand saw to keep dust down, to fit power tools with dust collection, and to wear eye, skin and respiratory protection where needed.
- Overhead sheets hurt people. A 4 x 12 sheet of 5/8 in Type X is around 106 lb, held over your head, at arm's length. Panel lifts are cheap next to a shoulder. If you want to see what the posture costs, run the load through the NIOSH lifting equation.
- Type X is a fire rating, not a thickness. Where a wall or ceiling assembly is rated, the panel, the fasteners, the spacing and the joint treatment are all part of the tested assembly. Substituting any of them voids it.
- Buy the mud in the right form. Setting-type compound and ready-mix are not interchangeable, and the coverage figures here are the ready-mix ones. Check the bag or bucket you are actually buying.
How it's calculated
- Area to cover
walls = 2 × (length + width) × height ; + ceiling (length × width) if selected ; − openingsPerimeter times height is the wall area of a rectangular room. An L-shaped room is two rectangles — run it twice, or switch to area mode and enter the number off your take-off.- Sheets
sheets = ceiling( area × (1 + waste %) / sheet area )Sheet area from the nominal panel size: 32 ft² for 4 x 8, 48 ft² for 4 x 12. USG lists 4 ft and 54 in widths in lengths from 8 to 16 ft.- Panel weight
weight (lb) = area (ft²) × nominal weight (lb/ft²)USG nominal weights: 1.2 lb/ft² at 1/4 in, 1.4 at 3/8 in, 1.25 for 1/2 in UltraLight, 2.2 for 5/8 in Firecode X. A 4 x 12 sheet of 5/8 in Type X is about 106 lb — a two-person lift on a ceiling, every time.- Joint compound
gallons = area (ft²) / 1,000 × coverage rateUSG publishes approximately 10 gal per 1,000 ft² of gypsum panels for Sheetrock All Purpose joint compound, and 9.4 gal per 1,000 ft² for Plus 3 lightweight. Buckets are 4.5 gal; cartons are 3.5 or 4.5 gal.- Joint tape
tape (ft) = area (ft²) / 1,000 × 370USG publishes approximately 370 ft of Sheetrock paper joint tape per 1,000 ft² of gypsum panels. Rolls come in 75, 250 and 500 ft.- Screws
screws per sheet = (floor(long side / framing spacing) + 1) × (floor(short side / screw spacing) + 1)Built from the maximum spacings USG publishes for single-layer panels over wood framing: screws 12 in on center on ceilings and 16 in on center on walls. The framing spacing you select sets how many members the sheet crosses. Nails are tighter — 7 in on ceilings, 8 in on walls.
Frequently asked questions
With 8 ft ceilings and the ceiling rocked, that room is 448 ft² of walls plus 192 ft² of ceiling, less about 42 ft² of door and window: 598 ft². In 4 x 12 sheets that is 13 sheets flat, or 14 with a 10% allowance.
Work from area, not sheets. USG publishes about 10 gallons of All Purpose joint compound per 1,000 ft² of panels, so a 4 x 12 sheet's worth of wall is roughly half a gallon. A 600 ft² room takes about 6 gallons, which is two 4.5 gal pails.
About 370 ft of paper tape per 1,000 ft² of panels, which is USG's published coverage. A 600 ft² room needs roughly 221 ft, so one 250 ft roll covers it.
It depends on the framing spacing and whether it is a wall or a ceiling. USG's maximum spacings over wood framing are 12 in on center on ceilings and 16 in on center on walls. Hung across studs at 16 in on center, a 4 x 12 sheet crosses 10 framing members and takes 4 screws on each of them: 40 screws. The same sheet on a ceiling takes 50, because the screw spacing tightens from 16 to 12 in.
From USG's published nominal weights: a 4 x 8 sheet of 1/2 in UltraLight is about 40 lb, a 4 x 12 about 60 lb. In 5/8 in Type X at 2.2 lb/ft², the same 4 x 12 sheet is about 106 lb. That is the number to check before anyone lifts one overhead.
Longer sheets mean fewer butt joints, and butt joints are the hardest ones to finish flat. The trade-off is weight and handling: a 4 x 16 sheet of 5/8 in Type X is around 141 lb and does not go around a stairwell. This calculator prices whichever you pick.
Only if you tell it to. Many hangers rock straight over an opening and cut it out afterwards, which wastes board but saves labor and puts the joints in better places. Set the openings field to zero if that is how you work.
No manufacturer publishes a waste factor for drywall, so this tool asks you instead of inventing one. A simple square room with long sheets can come in near 5%; a cut-up basement with soffits and bulkheads will beat 15%.
Sources & references
- USG Sheetrock Brand UltraLight Panels — Submittal Sheet WB2501: 1/2 in thickness, 4 ft and 54 in widths, 8 to 16 ft lengths, 1.25 lb/ft² nominal weight, and the fastener spacing table for single-layer panels over wood framing (screws 12 in o.c. ceilings, 16 in o.c. walls; nails 7 in and 8 in)
- USG Sheetrock Brand Gypsum Panels — Submittal Sheet WB1473: 1/4 in at 1.2 lb/ft² and 3/8 in at 1.4 lb/ft², 4 ft wide, 8 to 16 ft long
- USG Sheetrock Brand Firecode X Panels — Submittal Sheet WB2964: 5/8 in Type X, 4 ft and 54 in widths, 8 to 16 ft lengths, 2.2 lb/ft² nominal weight
- USG Sheetrock Brand All Purpose Joint Compound — Submittal Sheet J1969: coverage approximately 10 gal per 1,000 ft² of gypsum panels, 4.5 gal pail and 3.5 or 4.5 gal carton — USG Sheetrock Plus 3 Lightweight All Purpose Joint Compound (Submittal J498A) publishes 9.4 gal per 1,000 ft².
- USG Sheetrock Brand Paper Joint Tape — Submittal Sheet J1736: coverage approximately 370 ft per 1,000 ft² of gypsum panels, 2 1/16 in wide, rolls of 75, 250 and 500 ft
- 29 CFR 1926.1153 Table 1 — Respirable Crystalline Silica in Construction: drywall finishing is not on Table 1, but sanding joint compound generates respirable dust and the general duty to control it applies — Cited for the dust note, not for the quantities. USG's own caution is to cut and trim with a knife or hand saw to keep dust down and to use a dust collection system on power tools.
Content checked against these sources — last reviewed September 19, 2026.