Find out how many drywall sheets, screws, joint compound and tape you need for your room.
Start by finding the total area: calculate the wall area as 2 × (length + width) × height. If you are drywalling the ceiling, add length × width. That gives you the gross area in square feet.
Divide by the sheet area (32 sq ft for a 4×8, 48 sq ft for a 4×12) and round up to whole sheets. Add 10–15% for waste and cuts. For screws, budget about 32 per sheet. Joint compound runs roughly 1 gallon per 19 sq ft; tape about 1 foot of tape per 2 sq ft of board.
4×8 ft sheets are the standard and easiest to handle alone. 4×12 ft sheets cover more area per sheet and create fewer seams, but require two people to lift. Use 4×12 for tall walls or ceilings where fewer joints is worth the extra weight.
Yes — add 10% for a straightforward room and 15–20% for rooms with lots of cuts around doors, windows, outlets and odd angles. This calculator gives the net area; round up generously when ordering.
A common rule of thumb is about 0.053 gallons of compound per square foot of drywall — that works out to roughly 1 gallon per 19 sq ft. Joint compound is sold in 1-gallon and 5-gallon buckets; buy in larger buckets to save money and reduce waste.
This calculator estimates the drywall materials you need to cover any room — sheets, screws, joint compound and tape. Use it when planning a new build, finishing a basement, or patching a renovation so you can buy the right quantities before you ever set foot in a hardware store.
The headline figure is the total number of drywall sheets required, rounded up to the nearest whole sheet. Below it, a detail card breaks out screws, joint compound in gallons, and tape in linear feet. The horizontal bar chart compares all four materials on a shared scale so you can see at a glance which item to order in the largest quantity.
A 12 ft × 10 ft room with 9 ft walls (no ceiling), using standard 4 × 8 ft sheets.
Total wall area is 396 sq ft. You need 13 sheets, 416 screws, 21.0 gallons of joint compound (5 five-gallon buckets), and 198 ft of tape.
Drywall is sold in whole sheets and cut to fit. Rounding up ensures you have enough material even after accounting for cuts around doors, windows and corners — off-cuts generally cannot be returned.
Check the ceiling box only if you plan to drywall the ceiling too. Ceiling drywall adds the floor footprint (length × width) to the total area and increases all material totals accordingly.
A 4 × 12 sheet covers 48 sq ft versus 32 sq ft for a 4 × 8, so you need fewer sheets on tall walls and have fewer seams to tape — but the panels are heavier and harder to manoeuvre in tight spaces.
The calculator uses the industry rule of approximately 1 gallon per 19 sq ft (a factor of 0.053), which covers three coats of joint compound as recommended by USG. Actual usage varies with texture, taping technique and how much compound you feather out.
The estimate uses 32 screws per sheet, based on fastening drywall to studs at 16-inch spacing. Screws are placed every 12 inches on studs through the field and every 8 inches along edges — a total that tracks closely with the Inch Calculator and USG guidance.
Wall area is calculated as 2 × (length + width) × height, giving the perimeter surface. If the ceiling is included, the floor footprint (length × width) is added. Sheet count is the ceiling division of total area divided by the sheet area (32 sq ft for 4 × 8, 48 sq ft for 4 × 12). Screws are estimated at 32 per sheet, reflecting 16-inch stud spacing with fasteners at 12-inch field intervals and 8-inch edge intervals. Joint compound (mud) uses a factor of 0.053 gallons per square foot, equivalent to roughly 1 gallon per 19 sq ft for a three-coat finish, consistent with USG product guidance. Tape is estimated at 0.5 linear feet per square foot of drywall — one foot of tape per two square feet of surface — as documented by Inch Calculator. All formulas are sourced from Inch Calculator (https://www.inchcalculator.com/drywall-calculator/) and USG Corporation tools and resources (https://www.usg.com/content/usgcom/en/tools-resources.html).
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