Drywall Calculator
Estimate drywall sheets required, total surface area, joint compound, tape and screws for walls, ceilings, full rooms and custom areas — with engineering drawings and a printable PDF report.
Material cost estimate (optional)
How to estimate drywall quantity
Three simple steps from project dimensions to a complete sheet count and materials estimate.
Wall, ceiling, full room or custom area — choose the type so the right engineering drawing is shown and the correct surface-area formula is applied to the calculation.
Add length and height (and width for rooms), then pick a sheet size — 4×8, 4×10, 4×12 or a custom size — an orientation and a wastage allowance to match the complexity of the layout.
Drywall sheet count, total surface area, joint compound, tape and screws — broken out clearly with industry rules of thumb so you can order with confidence and add cost if you need a quote.
Drywall Calculator — Free & Accurate
Our drywall calculator helps drywall installers, general contractors, remodelers and DIY homeowners work out exactly how many sheets a job needs and what it will cost. Pick a project type — wall, ceiling, full room or custom area — enter the dimensions, choose your sheet size and orientation, and get a complete sheet count, joint compound, tape and screw estimate in seconds.
Sheet count is calculated as total surface area × (1 + wastage) ÷ sheet area, then rounded up to whole sheets. The standard 4 × 8 ft sheet covers 32 sq ft; 4 × 10 covers 40 sq ft; 4 × 12 covers 48 sq ft. Vertical orientation (sheets stood on end) is common in residential work for the cleanest single seam at the room midpoint; horizontal (sheets laid sideways) is preferred in commercial work because it puts the taped joint at a comfortable working height and runs perpendicular to studs for added stiffness.
Material estimates use widely accepted industry rules of thumb: ~1 screw per square foot (about 32 screws for a 4 × 8 sheet at 12″ o.c.), ~0.4 linear ft of paper tape per square foot (seams + inside and outside corners), and ~0.05 lb of joint compound per square foot for a three-coat finish (tape + 2 finish coats). An optional cost section covers drywall sheets, joint compound, tape, screws and labor in your local currency — USD, GBP, EUR, AUD, CAD, INR, BDT or AED. Everything runs in your browser — no signup, no data sent to any server.
Why use this calculator?
Built for the wall, the ceiling and the whole room — simple, fast, and accurate.
No spreadsheets, no estimating tables to look up. Type your dimensions, pick a sheet size, hit calculate — the sheets, screws, tape and compound are on screen.
Uses the same rules of thumb professional estimators use — ~1 screw per sq ft, ~0.4 ft of tape per sq ft, and ~0.05 lb of joint compound per sq ft for a three-coat finish.
Four project types covering the common cases — a single wall, a single ceiling, an entire room (4 walls + ceiling), or any custom total area you've already measured.
Everything runs in your browser. Your dimensions, sheet specs and cost data never leave your device.
Mix metres, feet, inches and centimetres on the same job. Results report both sq ft and sq m so the numbers match whatever your supplier or contractor quotes in.
Open it on your phone right on the job site. Fully responsive, no app needed — the same compact layout works on desktop and small screens.
Related construction tools
Free, browser-based, and built the same way as the rest of the DailyToolsAI construction suite.
Frequently asked questions
One 4 × 8 ft sheet covers 32 sq ft, so you'll need about 1 sheet per 32 sq ft of surface. A 4 × 10 sheet covers 40 sq ft (about 1 sheet per 40 sq ft); a 4 × 12 sheet covers 48 sq ft. After multiplying surface area by your wastage allowance and dividing by sheet area, always round up to whole sheets — you can't buy 3.2 sheets. For a 12 × 8 wall (96 sq ft) at 5% waste using 4 × 8 sheets: 96 × 1.05 = 100.8 sq ft ÷ 32 = 3.15 → 4 sheets. The calculator does all of this for you and reports the extra sheet you ordered as “Additional Sheets From Wastage”.
4 × 8 ft is the most common residential size — easy to carry by one person and fits standard 8-ft ceilings perfectly. 4 × 10 ft sheets reduce seam count for taller walls (10-ft ceilings, stairwells, vaulted areas). 4 × 12 ft sheets are used by professional commercial crews to minimize seams on long runs, but they're heavy and harder to handle. Vertical orientation (sheets stood on end) is typical in residential work and lines up well with stud spacing. Horizontal orientation (sheets laid sideways) is the commercial standard because it puts the long taped joint at a convenient working height (~4 ft off the floor) and runs perpendicular to the studs for added rigidity.
All three use widely-accepted industry rules of thumb. Screws: ~1 screw per square foot of drywall — matches the standard pattern of 32 screws per 4 × 8 sheet at 12″ on-center along studs. A 1-lb box holds about 250 screws (1-1/4″ coarse thread), so 1 box covers ~250 sq ft of drywall. Drywall tape: ~0.4 linear ft per square foot — covers all flat seams plus the typical complement of inside and outside corners. Standard paper-tape rolls are 500 ft. Joint compound: ~0.05 lb per square foot for a three-coat finish (tape coat + 2 finish coats). A standard 4.5-gallon ready-mix bucket weighs about 62 lb, so 1 bucket covers ~1,240 sq ft. These are starting points — complex layouts, lots of corners or skim-coat finishes will use more.
It depends on the complexity of the layout. 5% is enough for a clean, simple project — a long blank wall, a square ceiling with no penetrations. 10% is the recommended default for most jobs — covers the off-cuts you'll generate around windows, doors, outlets and ceiling fixtures. 15% is sensible for complex layouts with lots of openings, vaulted ceilings, soffits, curved walls, or when you're mixing sheet sizes. Wastage applies to all material counts (sheets, screws, tape, compound) because they all scale with surface area, and the additional sheets are broken out separately in the result card so you can see exactly how much buffer you're ordering.
Yes. Every dimension has its own unit picker, so you can enter the length in metres, the height in feet and the width in centimetres on the same calculation. Custom areas accept sq ft, sq yd or sq m. Results are reported in both sq ft and sq m for area, lb and kg for joint compound, and linear ft and m for tape — so the numbers match whatever your supplier or contractor quotes in.