Drywall calculator

Drywall sheets = wall and ceiling area × (1 + allowance ÷ 100) ÷ sheet area, rounded up.

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Wall and ceiling area

Area per sheet

More inputs and assumptions

Extra allowance (%)

Answer

…

Drywall sheets = wall and ceiling area × (1 + allowance ÷ 100) ÷ sheet area, rounded up.

More results

Precision and calculation record

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Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Step-by-step calculation

Inputs are substituted below. Each line evaluates the next operation; intermediate values are displayed to 12 significant digits while the calculation uses full precision.

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Formula and assumptions

Include every face and subtract openings as appropriate. This is an area estimate, not a cut plan, fire rating or framing specification.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Drywall calculator

Drywall sheets = wall and ceiling area × (1 + allowance ÷ 100) ÷ sheet area, rounded up.

Include every face and subtract openings as appropriate. This is an area estimate, not a cut plan, fire rating or framing specification.

Next: Flooring calculator

A worked example

With wall and ceiling area = 300, area per sheet = 32, extra allowance (%) = 10, the sheets to buy is 11.

Next: Paint calculator

Before you use the result

Include every face and subtract openings as appropriate. This is an area estimate, not a cut plan, fire rating or framing specification.

Example results for wall and ceiling area

These examples use Area per sheet: 32; Extra allowance (%): 10. They are reference calculations, not recommended settings.

Wall and ceiling area	Sheets to buy
150	6
300	11
600	21

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