Drywall Calculator — Sheets, Mud, Tape & Screws
Enter the room dimensions to size sheets, compound, tape and screws for hanging and finishing drywall.
Your numbers
32 = 4x8, 48 = 4x12, 64 = 4x16
Results
- Surface to cover362 walls + 168 ceiling
- 530 sq ft
- Sheets neededincludes 10% waste
- 19 sheets
- Estimated cost
- $1,081 – $1,526
- Joint compound~1 bucket per 100 sq ft, 3 coats
- 6 buckets (4.5 gal)
- Joint tape
- 212 lin ft
- Screws1-1/4" coarse thread
- 2 lb
- Corner bead
- 32 lin ft
Quantities are estimates for planning. Verify spans, spacing and local amendments before ordering.
How the math works
- Wall area = perimeter × ceiling height, minus 18 sq ft per opening (typical door/window average).
- Sheets = total area ÷ sheet size, plus 10% for cuts around openings and corners.
- Joint compound: roughly one 4.5-gallon bucket per 100 sq ft across three coats.
Code & best practice
- Use 5/8" Type X drywall on garage ceilings and any assembly with a fire-resistance rating (IRC R302).
- Water-resistant board is required behind tub and shower surrounds; use cement board under tile.
- Screws every 12" on ceilings and 16" on walls when studs are 16" on center.
Frequently asked questions
How many drywall sheets for a 12x14 room?
About 21 sheets of 4x8 board including 10% waste, covering walls and ceiling.
How much drywall mud do I need?
Plan on one 4.5-gallon bucket per 100 sq ft of board for a standard three-coat finish.
How much does drywall cost per square foot?
Hang and finish typically runs $2.00–$3.00 per sq ft of board, higher for Level 5 finish.