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Drywall Calculator

Find how many drywall sheets you need.

How it is calculated

Enter the wall area to cover in square metres and the sheet width and height in metres. sheet area = width × height and sheets = ⌈ area ÷ sheet area × 1.1 ⌉. The factor 1.1 adds a fixed 10% allowance for cut-offs, breakage and awkward corners, and the result is always rounded up to a whole sheet because you cannot buy part of one. The tool does not subtract doors and windows, so enter the net area you really need to board. All sizes must be above zero.

Worked example

A 40 m² area with sheets of 1.2 m × 2.4 m. Sheet area = 1.2 × 2.4 = 2.88 m². Sheets without waste = 40 ÷ 2.88 = 13.89. With 10% extra = 13.89 × 1.1 = 15.28, rounded up to 16 sheets.

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Common mistakes

  • Entering sheet sizes in millimetres or feet; the tool expects metres and reports the sheet area in m².
  • Entering the wall's length instead of its area; multiply length by height first.
  • Forgetting to subtract large openings such as doors and windows, or alternatively deducting them but ignoring that offcuts around them are partly wasted.
  • Counting only one face of a partition; a stud wall boarded on both sides needs double the area.
  • Assuming the 10% allowance covers ceilings with many cuts or two layers of board; add a second layer yourself.

About this calculator

This calculator divides total wall (and optionally ceiling) area by the coverage of a standard drywall sheet — most commonly 4×8 feet (32 sq ft) or 4×12 feet for fewer seams — and rounds up to a whole number of sheets, adding a fixed waste factor of 10% to cover cut-offs, breakage and awkward corners. Doors and windows are not subtracted, so enter the net area you actually need to board.

Contractors and DIY renovators pricing out drywall for a room use this before ordering, since sheets are sold individually and running short mid-job means a second trip and potential batch/texture mismatch, while over-ordering means paying to haul away unused boards. Larger sheets also mean fewer seams to tape and mud, which affects labor time as well as material cost, though the calculator itself only counts sheets.

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  • Editorial team

    The sheet count includes a fixed 10% allowance for cuts and breakage, and it is rounded up to whole boards. Enter the area you actually want to cover, ideally with door and window openings already subtracted, because the tool does not take them out for you. It also does not count joint compound, screws or tape. If your layout is mostly full-height walls, your own waste may be lower. How much extra do you usually buy on a job?

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