How many sheets of drywall do I need?

Divide the total wall and ceiling area by the area of one sheet (a 4 × 8 sheet is 32 ft²), then add about 10% for waste. Enter your area and sheet size above.

What size drywall sheet should I use?

4 × 8 sheets are easiest to handle; 4 × 12 sheets cover more area with fewer seams but are heavier and need two people.

How much waste should I allow for drywall?

About 10–15%, depending on the number of windows, doors, and corners.

Drywall Calculator

Work out how many drywall sheets you need. Enter the total area to cover and your sheet size to get the number of sheets, including a waste allowance.

Drywall calculator

Enter the total surface area to cover (add up walls and ceilings). Includes a waste allowance for cuts around doors, windows, and corners — 10–15% is typical.

How to use it

Add up the wall and ceiling area you're covering and enter it as length × height.
Pick your sheet size (4 × 8 is the standard).
Set a waste % (10–15%) and read off the number of sheets.

How it's calculated

We divide the total surface area by the area of one sheet (a 4 × 8 sheet is 32 ft²), add your waste percentage, and round up to whole sheets.

Frequently asked questions

How many sheets of drywall do I need?: Divide the total wall and ceiling area by the area of one sheet (a 4 × 8 sheet is 32 ft²), then add about 10% for waste. Enter your area and sheet size above.
What size drywall sheet should I use?: 4 × 8 sheets are easiest to handle; 4 × 12 sheets cover more area with fewer seams but are heavier and need two people.
How much waste should I allow for drywall?: About 10–15%, depending on the number of windows, doors, and corners.

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<p style="font:12px sans-serif">Drywall calculator by <a href="https://howmanycalc.com/drywall-calculator/">HowManyCalc</a></p>
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Last updated June 2026.