Home & Construction

Drywall Calculator

Estimate drywall sheet count from wall dimensions, room count, sheet size and waste allowance.

Free online toolWorks in your browserNo sign-up required

Drywall Calculator

Enable JavaScript to use the interactive calculator; the example and formula are described below.

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How to use this drywall calculator

Enter the values requested above and select Calculate. Change any input to compare another scenario. The calculation runs locally in your browser and does not require an account.

Formula and method

Total wall area is divided by the area of one drywall sheet, then increased by the waste allowance and rounded up.

Example

A 4×8 sheet covers 32 square feet before cuts and waste.

What this calculator is useful for

Estimate drywall sheet count from wall dimensions, room count, sheet size and waste allowance. The result is intended for quick estimates, checking arithmetic and comparing scenarios. When a result affects a contract, tax filing, medical decision, building-code requirement or other high-stakes situation, verify the result with the appropriate professional or authoritative source.

Drywall Calculator: a practical example

At 1,200 square feet of wall area, 4×8 sheets cover 32 square feet each; add 10% waste and round up to whole sheets.

What the result means

Use actual wall and ceiling surface area rather than floor area.

Limits to consider

Door and window cutouts, staggered seams, orientation, and fire-rated panels affect the final order.

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Frequently asked questions

What does the Drywall Calculator calculate?

Estimate drywall sheet count from wall dimensions, room count, sheet size and waste allowance.

How does the Drywall Calculator work?

Total wall area is divided by the area of one drywall sheet, then increased by the waste allowance and rounded up.

Is the Drywall Calculator free to use?

Yes. ERICH Calculators is free to use and does not require an account.

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Method, assumptions & corrections

See how formulas, sources and limitations are handled across ERICH Calculators.