Drywall Calculator
Size your drywall order. Enter the room dimensions and ceiling height, pick a sheet size, and add waste to get the total wall area, sheets needed, and an estimated installed cost.
Your project
Estimate
Sheets needed · Includes waste allowance
- Wall area
- 352ft²
- Estimated installed cost
- $975.00
Estimates are guidance only and exclude tax, labor, and site conditions unless stated. Confirm with a local pro.
How it's calculated
No black boxes — here is the exact math behind your estimate, so you can check it or adapt it for your own quote.
- 1
Wall area (ft²) = perimeter × wall height = [2 × (length + width)] × height - 2
Sheets = ⌈ (wall area ÷ sheet size) × (1 + waste% ÷ 100) ⌉ - 3
Cost = sheets × price per sheet
Worked example
A 12 ft × 10 ft room with 8 ft ceilings using standard 4×8 sheets.
Inputs
- Room length
- 12 ft
- Room width
- 10 ft
- Wall height
- 8 ft
- Sheet size
- 32
- Waste allowance
- 10 %
- Price per sheet
- 75 $/sheet
Result
- Sheets needed
- 13 sheets
- Wall area
- 352 ft²
- Estimated installed cost
- $975.00
Tools & materials for this project
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- Drywall screws Fasten panels to studs and ceiling joists.
- Joint compound Tape and finish the seams smooth.
- Taping knife set Spread and feather compound over joints.
Compare local pros for drywall installation
An estimate gets you a budget. A few competing quotes get you the real price. Tell us about the job and we'll help you find vetted contractors nearby.
Drywall cost by state
The calculator does the quantity math exactly. What it can't know is what a fair unit price looks like where you live — drywall installation runs 61% more in the priciest US market than the cheapest.
Drywall cost in all 50 states + DC US average $75 per sheet installed · regional averages, full ranked table, and typical project totals.