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HeizerDesk Drywall Calculator
Enter the room and pick your sheet size. This returns sheets, screws, tape and how many buckets of compound the job takes — the three materials people run out of on a Sunday. It is a free Drywall Calculator for drywall work, with the formula printed below the answer.
Your numbers
Result
Drywall sheets
21
sheets
- Joint compound4.5 gal, ~400 sq ft each
- 2buckets
- Joint tape
- 240linear ft
- Screws~32 per sheet
- 672screws
- Screws by weight
- 2.1lb
- Net area to cover
- 600sq ft
- Area incl. waste
- 660sq ft
- Gross area
- 640sq ft
How this is calculated
- Wall area = 2 × (length + width) × ceiling height.
- Ceiling area = length × width, if you are boarding it.
- Net = gross − doors and windows, then × (1 + waste %).
- Sheets = area ÷ sheet size, rounded up.
- Tape ≈ 0.4 linear feet per square foot of board. Compound ≈ one 4.5 gallon bucket per 400 sq ft for three coats.
Before you order
- Longer sheets mean fewer butt joints, and butt joints are the ones that show. If 12 ft sheets will fit through the door and up the stairs, use them.
- Ceilings want 5/8 in board on 24 in centres or they sag. 1/2 in is for walls.
- Compound is three coats plus sanding, and the estimate above assumes that. A level 5 finish for gloss paint or raking light needs materially more.
- Moisture-resistant or cement board is required behind tile in wet areas and is not interchangeable with regular board.