Drywall Sheet Calculator

Calculate how many drywall sheets you need for a project. Supports 4×8, 4×10, and 4×12 sheets with a waste factor.

drywall
Sheets Needed
— sheets
Rounded up.

Usage Tip

Longer sheets mean fewer seams to tape and finish. Use 12-foot sheets on long walls when you can handle them.

THE MATH
sheets = round up( area × (1 + waste ÷ 100) ÷ sheet area )
Drywall comes in 4-foot-wide sheets of 8, 10, or 12 feet. The count is the total wall and ceiling area divided by one sheet area, plus a waste allowance for cuts.
Enter the combined wall and ceiling area, pick the sheet size, and set a waste percentage (10 percent is typical).
The result rounds up to whole sheets.
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.