Drywall Calculator — Estimate How Many Sheets You Need

Total Area (sq ft)Enter a valid area.

Sheet Size

Waste Allowance (%)

Drywall Sheets Needed

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How to Use This Tool

Enter your total wall and ceiling area to be drywalled.
Select your sheet size.
Click Calculate to see how many sheets to order.

The Drywall Formula

Sheets Needed = (Total Area × (1 + Waste %)) ÷ Sheet Coverage

Standard Drywall Sheet Sizes

4' × 8' (32 sq ft): The most common size, easy for one or two people to handle
4' × 12' (48 sq ft): Reduces the number of seams on taller walls, but heavier and harder to maneuver

Why Fewer Seams Can Be Worth It

Using longer sheets reduces the number of seams that need taping and mudding, which can improve the finished look and reduce labor time, even though the sheets themselves are more unwieldy to install.

Frequently Asked Questions

Does this include ceiling area?

Yes, include your ceiling square footage in the total area if you're also drywalling the ceiling — just add it to your wall area before entering the total.

Should I subtract door and window openings?

For a more precise estimate, yes — subtract the area of large openings. Many contractors skip this for simplicity since the waste allowance often absorbs the difference, especially with smaller window openings.

This calculator is provided for general informational and estimation purposes only. Results should not be treated as professional financial, tax, legal, medical, or engineering advice. Always verify critical calculations with a qualified professional or official source before making decisions.