Drywall Calculator
Calculate the exact number of 4×8 ft drywall sheets for your project — walls and ceiling with all openings deducted.
How It Works
Calculates wall area minus openings, adds ceiling if selected, applies 10% waste, and divides by 32 sq ft per sheet.
Formula
Wall Area = 2(L+W) × H − Openings
Sheets = (Walls + Ceiling) × 1.10 ÷ 32
Example
12×14 ft room, 8 ft ceiling, 2 windows, 1 door, with ceiling:
~534 sq ft × 1.10 / 32 = 19 sheets
When to Use This Calculator
Use before any drywall renovation or new construction to order the correct quantity.
Common Mistakes to Avoid
- No corner waste budget — add 10% minimum.
- Wrong thickness — 1/2" standard interior; 5/8" ceilings and fire-rated.
- Ordering exact count — always round up to full sheets.
Frequently Asked Questions
Drywall thickness?
1/2" standard walls; 5/8" ceilings and fire-rated; 3/8" curved surfaces.
Screws per sheet?
~32 screws per 4×8 sheet (every 12" into studs at 16" OC).
DIY drywall?
Walls: manageable solo. Ceilings: much easier with 2 people or a drywall lift.
Cost?
$12–$20 per 1/2" 4×8 sheet. Specialty types cost more.
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Last Updated: July 4, 2026