How this calculator works
Convert wall and ceiling area into full drywall sheets with an adjustable waste factor. Use the result as a planning estimate, then verify board size and local installation requirements.
Board area = wall area + optional ceiling − openings. Sheets = board area × (1 + waste) ÷ sheet area, rounded up.
Example
For a simple 12 × 10 ft room, walls plus ceiling can exceed 450 sq ft before subtracting openings.
How to get a better estimate
- Use larger sheets only if access and handling allow it.
- Complex rooms need more waste than simple rectangles.
- Order a small reserve if matching existing thickness or edge type is important.
What the result means
The result is a planning estimate. Dimensions, coverage, density, packaging and installation conditions vary by product and project. For purchasing, compare the result with the exact product label or supplier specification. For structural, electrical, code-regulated or safety-critical work, use an appropriately qualified professional.
Common questions about the Drywall Calculator
What does this calculator estimate?
Convert wall and ceiling area into full drywall sheets with an adjustable waste factor. Use the result as a planning estimate, then verify board size and local installation requirements.
What formula does it use?
Board area = wall area + optional ceiling − openings. Sheets = board area × (1 + waste) ÷ sheet area, rounded up.
How should I use the result?
Use it as a planning estimate, then verify the dimensions and replace editable defaults with the specifications for the product or service you actually intend to buy.