Enter the wall and ceiling area to see how many drywall sheets to buy — plus rough screw and joint-compound quantities.
What this calculator estimates
Drywall shopping is three linked quantities: sheets, screws and mud. Enter the total area, pick the sheet size, and set a waste allowance — the calculator rounds the sheets up to whole boards and adds the rule-of-thumb accessories: roughly 28 screws per sheet and about 5 lb of ready-mix joint compound per 100 square feet across three coats.
How to use it
- Add up the wall and ceiling areas in square feet (skip large openings like garage doors; small windows are usually left in as the waste allowance).
- Pick the sheet size — 4×8 is the standard, longer sheets mean fewer joints.
- Set the waste percentage — 10% suits simple rooms, more for many corners.
The formula
sheets = area × (1 + waste) ÷ sheet coverage, rounded up
A worked example
A 480 sq ft room with 10% waste on 4×8 sheets: 528 ÷ 32 = 16.5 → 17 sheets, with roughly 476 screws and about 24 lb of compound. Longer 4×12 sheets would cut it to 11 boards — fewer joints to tape, but harder to carry through a doorway, which is the real trade-off.
Common questions
Do I subtract doors and windows?
Subtract big openings (garage doors, sliders); leave standard doors and windows in — the cut-outs become your waste and the sheets around openings need full-piece anchoring anyway.
Which thickness do I need?
1/2″ is standard for walls, 5/8″ for ceilings and fire-rated assemblies, and moisture-resistant board for bathrooms — local code has the final word.
How much tape?
Plan on roughly 1 roll (500 ft) per 15–16 sheets — joints scale with sheet count, so the sheet number above is the anchor.