Drywall Calculator
Estimate how many drywall sheets cover a room's walls and ceiling, after doors and windows.
Drywall sheets
21
- Wall area
- 416 ft²
- Ceiling area
- 168 ft²
- Area to cover
- 584 ft²
- Area with waste
- 642.4 ft²
Material counts are estimates — check with your supplier and local code before you buy.
Show the work
Wall area: perimeter × height
walls = 2 × (length + width) × height
2 × (14 + 12) × 8 = 416 ft²
Area to cover: walls + ceiling − doors and windows
area = walls + ceiling − openings
416 + 168 − 0 = 584 ft²
Sheets, plus waste, rounded up
sheets = ⌈area × (1 + waste ÷ 100) ÷ sheet area⌉
⌈584 × (1 + 10 ÷ 100) ÷ 32⌉ = 21
How it works
Area = 2 × (length + width) × height + ceiling − openings; sheets = area × (1 + waste) ÷ sheet area, rounded up
Questions
- How does the drywall calculator work?
- Area = 2 × (length + width) × height + ceiling − openings; sheets = area × (1 + waste) ÷ sheet area, rounded up.
- What do I need to enter?
- Room length, Room width, Wall height, Ceiling too?, Sheet size, Doors and windows area, Extra for waste. Optional fields can be left blank.
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