Drywall sheet calculator
Sheet count is area divided by sheet area plus waste. The fixings and finishing come from the same area.
%
Sheets needed
23
- Exact sheet equivalent
- 20.83
- Screws
- 750
- Joint tape
- 78
- Joint compound
- 54.0
- Total board weight
- 629
Show the working
- Area to board = 60
- Sheet length = 2.4
- Sheet width = 1.2
- Waste allowance = 10
- Screw spacing = 200
- sheet_area = 2.4 * 1.2 = 2.88
- Sheets needed = ceil(60 * (1 + 10/100) / 2.88) = 23
- Screws = ceil(60 * (1000/200) * 2.5) = 750
- Joint tape = 60 * 1.3 = 78
- Joint compound = 60 * 0.9 = 54
- Total board weight = 23 * 2.88 * 9.5 = 629.28
- Exact sheet equivalent = 60 / 2.88 = 20.8333
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- sheets = ceil(area x (1 + waste) / sheet area)
A 12.5 mm sheet weighs about 9.5 kg per square metre — a 2.4 by 1.2 m sheet is 27 kg and a genuine two-person lift.