Drywall Calculator
Free drywall calculator—estimate sheets from wall/ceiling area, sheet coverage, and waste.
Results
11Sheets to buy
- 11Exact sheets
How it works
Sheets = (area × (1 + waste%)) ÷ sheet coverage. We ceil to whole sheets.
Worked example
Example: 320 sq ft, 32 sq ft/sheet, 10% waste → 11 sheets.
Common sheet sizes
A 4×8 sheet covers 32 sq ft; 4×12 covers 48 sq ft. Enter the coverage for the sheets you will hang.
Waste
Simple rectangular rooms may need ~10%. Lots of openings or stairwells may need more.
Ceilings vs walls
Add ceiling and wall areas separately if thicknesses differ, then sum sheets.
Frequently asked questions
How many 4×8 sheets for a room?
Divide adjusted area by 32, then add waste. This calculator does that when sheet coverage is 32.
Should I buy extra sheets?
Rounding up covers mishits and odd cuts. Keep a spare for repairs if dye lots matter for texture.
Does this include screws and mud?
No—only sheet count. Fasteners and joint compound follow coverage charts on the bags.
Estimates only. Verify coverage rates and local requirements before purchasing materials. Not a substitute for professional advice.