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🧱 Drywall Calculator

Enter your room dimensions to find exactly how many drywall sheets you need for walls and ceiling, plus estimated joint compound, tape, and screws.

🧱 Enter Room Details

Drywall Sheets Needed
0

Material Estimate

0 sq ft
Total Area
0 gal
Joint Compound
0 ft
Joint Tape
0
Screws

How Drywall Materials Are Estimated

Wall Area

Wall Area = Perimeter × Wall Height

Sheets Needed

Sheets = (Total Area ÷ Sheet Coverage) × (1 + Waste%)

4×8 sheet = 32 sq ft  ·  4×12 sheet = 48 sq ft

Joint Compound

Gallons ≈ Number of Sheets × 0.5

Joint Tape

Tape (ft) ≈ Number of Sheets × 25
(approximate seam length per sheet)

Screws

Screws ≈ Number of Sheets × 32 (walls)
Screws ≈ Number of Sheets × 40 (ceilings, closer spacing)

Frequently Asked Questions

Divide the total wall (and ceiling, if applicable) area by the coverage of one sheet - a standard 4×8 ft sheet covers 32 square feet, and a 4×12 ft sheet covers 48 square feet. Add 10-15% extra for waste from cuts, corners, and openings like doors and windows. For example, 800 sq ft of wall area ÷ 32 sq ft per 4×8 sheet ≈ 25 sheets, plus a waste allowance.
4×8 ft sheets are the most common and easiest for one or two people to handle and maneuver into place. 4×12 ft sheets cover 50% more area per sheet and reduce the number of seams that need taping and mudding, which can improve the finished look, but they're heavier and harder to maneuver, especially alone or in tight spaces.
A common estimate is about 0.5 gallons of joint compound per 4×8 sheet for a standard 3-coat finish, though this varies with technique, the number of coats, and how many seams and corners are involved. Joint compound is typically sold in 4.5-gallon buckets, which generally covers roughly 8-10 sheets' worth of seams.
A standard rule is about 32 screws per 4×8 sheet on walls (roughly one screw every 16 inches along studs, in a grid pattern), or slightly more for ceilings since screws should be spaced closer together (every 12 inches) to prevent sagging. A 1-pound box typically holds around 320 screws, enough for roughly 10 wall sheets.

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Drywall Calculator - Sheets, Mud, Tape & Screws for Any Room

Drywalling a room involves more than just the sheets themselves - joint compound, tape, and screws all need to be estimated too, and running short on any of them mid-project means a frustrating supply-run delay. This calculator estimates all four from your room's dimensions and chosen sheet size.

Quick formula: Sheets = (Wall Area ÷ Sheet Coverage) × 1.10 (10% waste)
Standard sheet: 4×8 ft = 32 sq ft per sheet

4×8 vs. 4×12 Sheets

Standard 4×8 ft sheets are the most common choice for good reason - they're manageable for one or two people to carry and position, especially in tight stairwells or hallways. Larger 4×12 ft sheets cover 50% more area per sheet, meaning fewer seams to tape and mud (which can mean a smoother finished wall and less material), but they're significantly heavier and harder to maneuver alone. For ceilings especially, many installers prefer help or a drywall lift regardless of sheet size.

Don't Forget the Finishing Materials

  • Joint compound (mud): Needed for every seam and screw head, typically applied in 2-3 coats for a smooth, paint-ready finish.
  • Joint tape: Paper or mesh tape embedded in the first coat of mud to reinforce every seam against cracking.
  • Screws: Drywall-specific screws (not general wood screws) spaced along studs - closer together on ceilings to prevent sagging.
  • Corner bead: Metal or plastic trim for outside corners, not included in this estimate - measure corners separately.

How this calculator works, and where the numbers come from

The Drywall Calculator applies the standard formula for this calculation to the values you enter and updates the result as you type. The calculation itself happens in your browser, and the page explains the method so you can check any result by hand.

Please note: Results are estimates. Add allowance for waste and check product labels and local building codes before you buy or build.

Sources and further reading

Learn more

Read our guide: How Much Paint, Flooring and Concrete Do You Actually Need?

Last reviewed: by the CalcQube Editorial Team. See our editorial policy for how we build and check calculators, or report an error.