What the tool does, how to run it, and what to expect from the result.
Wall area is the room's perimeter times the wall height; ceiling area, if included, is length times width. The total is divided by a sheet's area (32 sq ft for a standard 4x8 sheet, 48 sq ft for a 4x12) after adding a waste allowance, 10% is typical for a simple rectangular room, more for a room with lots of cuts and corners.
A quick way to understand who this helps, what it solves, and where it connects next.
DIYers and contractors framing out a room before buying drywall.
Estimating sheets of drywall for walls and, optionally, a ceiling.
Short answers for the questions people usually have before trying a utility like this.
Yes. It is completely free, with no sign-up and no usage limits.
No. Every number is computed locally in your browser tab.
Most estimators don't, since the cut-off pieces around openings are often too small to reuse elsewhere and effectively become part of the waste allowance. For a room with unusually large openings, subtract them manually.
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Enter a room's dimensions to get the wall (and ceiling) area and how many drywall sheets you need.
472 sq fttotal drywall area before waste
17 sheetsof 4 x 8 ft board, including a 10% cutting allowance
Openings (doors, windows) aren't subtracted here since cut-offs from around them usually still count toward waste; subtract manually if a room has unusually large openings.