Sheetrock / Drywall Calculator
Estimate sheets of drywall needed for walls and ceilings, with waste factor included.
How to Use This Calculator
1. Enter room length, width, and ceiling height for each room.
2. Doors and windows are deducted from the total. Ceiling area is included automatically.
3. Select the sheet size you plan to use — 4×12 means fewer seams and less finishing work.
Waste factor: 10% waste is automatically added for cuts and offcuts.
Real-World Examples
Walls: 416 sq ft + Ceiling: 168 sq ft − 50 = 534 sq ft × 1.1 = 587 ÷ 32 = 19 sheets
Frequently Asked Questions
½" is standard for walls and ceilings. ⅝" Type X is used for fire-rated walls (garages, between units). ¼" is for curved walls or over existing drywall.
A 4×8 sheet of ½" drywall typically costs $10–$16 at home improvement stores. Prices vary by region and thickness.
A typical 10×12 ft bedroom (8-ft ceiling) needs about 15–18 sheets of 4×8 drywall including the ceiling.
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