basic

Drywall Sheets Needed for a Room Calculator

Total drywall area / sheet area — with 10 % waste and openings deducted.

Compute how many 4 × 8 ft (32 ft²) drywall sheets are needed to finish all four walls and the ceiling of a rectangular room: total area = 2·(L + W)·H + L·W − openings, then ceil((total · 1.10) / 32) for the 10 % waste factor. Reports raw area, padded area, and number of sheets.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

ft
ft
ft
ft²
ft²
%

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

sheets = ceil(((2(L+W)·H + L·W) − openings) · 1.10 / 32).

In depth

Compute how many 4 × 8 ft (32 ft²) drywall sheets are needed to finish all four walls and the ceiling of a rectangular room: total area = 2·(L + W)·H + L·W − openings, then ceil((total · 1.10) / 32) for the 10 % waste factor. Reports raw area, padded area, and number of sheets.