Drywall Calculator
Calculate drywall or Sheetrock sheets, screws, joint compound, and tape by entering room dimensions. Get a full material list for your project.
Last updated 2026-08-21
What Is a Drywall Calculator?
The drywall calculator estimates how many sheets of drywall you need to cover your walls and ceiling. You enter your wall area, ceiling area, and the panel size, and it returns the sheet count. It is the first step to a full drywall material list for a room or whole home.
How It Works
Total area = Wall area + Ceiling area. Sheets = ceil(Total area ÷ Sheet area).
Example
800 sq ft of walls + 200 sq ft of ceiling = 1,000 sq ft → 32 sheets of 4×8.
How to Calculate
- Measure and add up your wall area. For a project with 800 sq ft of walls and 200 sq ft of ceiling, enter 800 for Wall Area and 200 for Ceiling Area.
- Add the two to get the total: 800 + 200 = 1,000 sq ft.
- Choose the Panel Size. A standard 4 × 8 sheet covers 32 sq ft; 4 × 10 covers 40; 4 × 12 covers 48.
- Divide the total area by the sheet area: 1,000 ÷ 32 = 31.25.
- Round up to the next whole sheet and add waste. 31.25 rounds to 32 sheets, and adding 5 to 10% for cutouts and mistakes gives you about 34 sheets.
Drywall sheet coverage
| Sheet size | Square feet per sheet |
|---|---|
| 4 × 8 ft | 32 sq ft |
| 4 × 9 ft | 36 sq ft |
| 4 × 10 ft | 40 sq ft |
| 4 × 12 ft | 48 sq ft |
| 4 × 14 ft | 56 sq ft |
Sources
Frequently Asked Questions
What sheet size should I use?
4×8 is standard. 4×10 and 4×12 reduce seams and waste on taller walls.
How much drywall does a sheet cover?
A 4×8 sheet covers 32 sq ft; 4×10 covers 40; 4×12 covers 48.
Should I add waste?
Yes, 5–10% for door/window cutouts and mistakes.
Estimate the cost with the Drywall Cost Calculator. Also try: Drywall Sheets Calculator, Drywall Cost Calculator or browse Drywall Calculators