Drywall Calculator
Estimate the drywall sheets and finishing materials needed for walls and ceilings. Enter areas and deductions to get sheets, compound, tape, and screws.
Results
Enter your measurements to see an estimate.
Calculated: — EasyBuildTools, www.easybuildtools.com
How to use the undefined
Enter the total run of walls and their height, plus the ceiling size if you are drywalling it. Subtract large openings with the deductions field (a standard door is about 20 sq ft). Set the sheet coverage (a 4×8 sheet is 32 sq ft) and a waste allowance. The tool estimates sheets, joint compound, tape, and screws.
Formula and methodology
Gross area = (wall length × wall height) + (ceiling length × ceiling width). Net = gross − deductions. Adjusted = net × (1 + waste%/100). Sheets = adjusted ÷ sheet coverage, rounded up. Compound ≈ 0.053 lb/sq ft, tape ≈ 0.75 ft/sq ft, screws ≈ 40 per sheet.
Worked example
Room: 40 ft of wall × 8 ft = 320 sq ft, ceiling 12×10 = 120 sq ft, 40 sq ft deductions, 10% waste, 32 sq ft sheets. Net = 400 sq ft, adjusted = 440 sq ft ÷ 32 = 14 sheets. Enter the values above to confirm.
Helpful measurement tips
- Use 12 ft sheets on long walls to reduce butt joints where practical.
- Finishing supplies vary with the number of coats — treat compound and tape as rough guides.
- Ceilings often use thicker or sag-resistant board; check your span.