Drywall Calculator - Sheets, Screws, Tape & Joint Compound
Drywall Calculator
How many drywall sheets does your room need?
Whole-Job Estimate
Get the number of sheets plus screws, joint tape and joint compound, so one calculation covers the shopping list.
Openings Deducted
Doors and windows are subtracted using standard sizes, and you can include the ceiling too.
Metric or Imperial
Common sheet sizes for both systems, with your measurements converted when you switch.
Full Privacy
Everything is calculated in your browser.
How the Estimate Works
Wall area is the room's perimeter times its height; add length × width if you are boarding the ceiling, then subtract openings (about 21 sq ft for a door and 15 sq ft for a window, or 1.9 and 1.4 m²). Add a waste allowance, typically 10%, for cuts and mistakes, and divide by the area of one sheet, rounding up. A 12 × 10 ft room with 8 ft walls, one door and one window needs about 11 standard 4 × 8 ft sheets.
Screws (about one per square foot), tape (about 0.37 ft per sq ft) and joint compound (about 0.01 US gallon per sq ft) are rules of thumb, and real use varies with the finish level, the product and the installer. For large or unusual rooms, tall walls and stair halls, measure each wall and buy a little extra rather than relying on a single estimate.
Key Takeaways
- Rounds up: You cannot buy part of a sheet, so the count always rounds up.
- Checked inputs: Warns if openings would use up all the wall area.
- Estimates: Consumables use standard rules of thumb.