Estimate drywall sheets, screws, joint compound, tape, and installation costs instantly using our accurate drywall calculator designed for remodeling, interior construction, ceilings, walls, basements, and renovation projects.
Enter wall dimensions — your sheetrock calculator updates live
Load typical bedroom, basement, garage, and ceiling jobs, then adjust for your layout.
12×12 room, 8 ft walls, four walls plus ceiling.
20×16 footprint, 8 ft height, moisture-resistant board.
24 ft walls, 9 ft height, three sides (open garage door).
16×12 ceiling repair — walls excluded, ceiling only.
Our drywall estimator calculates surface area for walls and optional ceilings, converts to standard sheet counts, and estimates fasteners and finishing materials using industry planning ratios.
Each wall section contributes length × height. Multiply by the number of walls when sections share the same dimensions. For rectangular rooms with mixed wall lengths, run separate calculations per wall group or measure total net wall area from plans.
A 4×8 sheet covers 32 square feet of surface. Divide total area (with waste) by coverage and round up. Larger 4×10 and 4×12 sheets reduce butt joints on tall walls and long ceilings — select sheet size in advanced options.
Planning ratios used in this drywall material calculator: about 32 screws per sheet, one joint compound bucket per 500 sq ft, and one tape roll per 400 sq ft. Adjust on site for texture, heavy butt joints, or multiple coat finishes.
Pros measure net drywall surface, add 10% waste minimum, round to full sheets, and order one extra sheet on small jobs. They separate moisture board for baths, fire board for garages, and 5/8 inch type X where codes require it.
Cutouts for doors, windows, and electrical boxes recover some area, but offcuts are not always usable. Waste covers bad cuts, damaged corners, and layout mistakes. Enable the waste toggle for quick 10% — increase for complex rooms.
Typical board type, thickness, and sheet count per 100 sq ft (before waste).
| Application | Recommended Drywall Type | Drywall Thickness | Sheets per 100 sq ft (4×8) |
|---|---|---|---|
| Bedrooms | Standard drywall | 1/2 inch | ~3.1 sheets |
| Basements | Moisture / mold resistant | 1/2 inch | ~3.1 sheets |
| Garages | Fire resistant (Type X) where required | 5/8 inch | ~3.1 sheets |
| Ceilings | Lightweight or standard | 1/2 inch (5/8 for spans) | ~3.1 sheets |
| Bathrooms | Moisture resistant / cement board in wet areas | 1/2 inch | ~3.1 sheets + specialty board at tub/shower |
Drywall — often called sheetrock, gypsum board, or wallboard — is the finish surface for most interior walls and ceilings in North America. Ordering too few sheets delays the job; ordering too many wastes money and truck space. This guide explains how to calculate drywall quantity, choose thickness and type, plan fasteners and mud, and use a drywall calculator or sheetrock calculator the way remodeling contractors do before they visit the supply house.
Start with a simple sketch of each room. Label wall lengths and ceiling dimensions. For each wall segment, multiply length × height. Add segments together or use one average wall length × height × number of walls when sections match, as our tool does.
Add ceiling area if you are hanging the lid: length × width of the room footprint. Subtract large openings only when you are confident recovered scraps will not be used elsewhere — many estimators keep full wall rectangles for safety. Divide total square footage by sheet coverage (32 sq ft for 4×8), apply waste, round up. That is the core of every drywall sheet estimation workflow.
Sheets are sold in 4-foot widths and 8-, 10-, or 12-foot lengths. Coverage is width × length: 32, 40, or 48 square feet. A 12×12 room with 8-foot walls and four walls has 12×8×4 = 384 sq ft of wall area, plus 144 sq ft of ceiling = 528 sq ft. With 10% waste, about 581 sq ft ÷ 32 ≈ 19 sheets — matching what you get from our bedroom example preset.
Always round up to whole sheets. Big-box stores rarely sell partial boards. On multi-room jobs, sum each room then add one contingency sheet per truckload for damage.
Remodels add demolition, texture matching, and phased occupancy. Measure only surfaces you will hang — patch jobs might be one wall, not four. Check existing thickness so new board flush-mounts with old drywall; mixing 1/2 inch and 5/8 inch without shimming shows at joints.
Account for new openings: kitchen openings into living spaces, enlarged windows, and soffits above cabinets all change net area but add cut labor. A wall drywall calculator gives area; labor quotes still need difficulty factors for stairs, high ceilings, and occupied homes.
Basements need moisture strategy before board goes up. Frame with pressure-treated bottom plates on concrete, insulate per climate zone, and consider vapor retarder placement. Use moisture-resistant or mold-resistant board on below-grade walls; some codes require foam board or drainage before framing.
Ceilings in basements are often lower — 4×8 sheets may work without vertical joints. Include ceiling area in totals; basement ceilings are frequently forgotten. Coordinate with concrete work if you are pouring walks or pads in the same renovation phase.
1/2 inch is standard for residential walls and many ceilings. 5/8 inch adds fire rating and stiffness on ceilings with 24-inch on-center framing or long spans. 1/4 inch bends on curved walls and overlays. Garages attached to living space often need Type X 5/8 on shared walls — verify locally.
Soundproof board is denser and heavier; plan extra hands for ceilings. Lightweight board reduces fatigue on overhead work. Thickness does not change area math but affects screw length and screw gun depth settings.
Hang ceilings first on residential jobs so wall boards capture ceiling edges. Screw field spacing is typically 12 inches on walls and 8 inches on ceilings for 1/2 inch board — tighter at edges. Stagger vertical joints between courses. Leave a 1/8-inch gap at floor; cover with baseboard.
Factory edges are tapered for tape; cut ends are butts requiring more compound. Plan layout so tapered joints meet, minimizing butt lines at eye level across large walls.
Green or purple moisture-resistant board suits bathrooms and laundry rooms but is not a substitute for cement board or waterproof membrane in direct wet zones inside showers. Use cement board or foam backer board plus liquid membrane where tile meets water.
Basements benefit from mold-resistant paper faces even when not “wet” rooms — humidity swings matter. Never hang standard board directly against uninsulated cold concrete; build a ventilated cavity or use approved systems.
Finishing levels range from Level 0 (no finish) to Level 5 (skim entire surface). Most homes are Level 4: tape, three coats on joints, sand, prime. Joint compound consumption varies more than sheet count — textured ceilings and butt-heavy layouts need extra mud.
Tape choices include paper (stronger, harder for beginners) and mesh (fast, not ideal for butts). This tool estimates one roll per 400 sq ft as a planning average; complex jobs need more.
Quote materials separately from labor. Material takeoff uses net area + waste; labor uses area plus height, access, texture, and inspection hold points. Photograph framing before hang — crooked studs become your problem after board is screwed.
Share this drywall cost calculator with homeowners during sales calls to align sheet counts before change orders. Under-ordering erodes margin; over-ordering without reason erodes trust.
Sheetrock is a brand name that became generic speech. Gypsum board, wallboard, and plasterboard mean similar products. The math is identical regardless of name — area, sheets, fasteners, and finish materials.
Enter meters or centimeters; the calculator converts to feet internally for sheet math (U.S. sheet sizes). For metric markets with 1.2×2.4 m boards, adjust coverage mentally or use the closest foot equivalent until local sheet sizes are added.
Interior work sits inside a shell. Use our roof pitch calculator when attic or vaulted ceiling framing affects wall height. Exterior asphalt and gravel tools help with site access and staging pads — unrelated to board count but part of whole-job planning.
Ready to hang? Use the drywall calculator above, copy results to your order list, and explore all tools on YardsCalculator. Accurate area takeoff, realistic waste, and the right board type keep remodeling projects on schedule and on budget.
Calculate wall area (length × height × number of walls), add ceiling area if needed, add waste (typically 10%), divide by sheet coverage (32 sq ft for 4×8), and round up. Our drywall calculator does this automatically.
Measure all wall and ceiling surfaces in square feet, multiply by 1.1 for waste, divide by 32 for standard 4×8 sheets, and round up. A 12×12 room with 8 ft walls and ceiling is often about 14 sheets with waste.
4×8 sheets are most common and easiest to handle. Use 4×10 or 4×12 on tall or long walls to reduce horizontal joints and finishing labor.
About 3.125 sheets of 4×8 drywall (32 sq ft each) at net area — plan 4 sheets with waste and cut loss.
About 32 screws per 4×8 sheet on walls with typical spacing; ceilings need more screws per code and manufacturer specs — often 7 inches on center in the field.
Area and sheet math are exact when your dimensions are correct. Complex architecture, niches, and slope ceilings need manual adjustments beyond a single rectangle model.
Standard 1/2 inch boards often cost $15–$25 per sheet at retail; fire-rated, soundproof, and lightweight products cost more. Enter your local quote in the cost field.
Yes. Add about 10% for typical rooms; 15% or more for complicated layouts, many openings, or beginner crews.
Use moisture-resistant board on bathroom walls and ceilings outside direct wet zones; use cement board or equivalent waterproof systems in shower and tub surrounds per code.
Yes. Enter length, height, and width in meters or centimeters. The tool converts to feet for U.S. sheet sizing and displays areas in square feet.