Standard drywall sheets are 4 x 8 feet. To determine how many sheets you need for your project, enter the measurements—rounded to the nearest foot—into our pop-up calculator. A 10 percent waste allowance is automatically added to the total.

 Tips on Measuring for Drywall

Before you begin, take the room measurements in the list below. If you have sloping walls, follow the special case instructions on how to determine this square footage.

1. Wall height
   Measure from floor to ceiling.

2. Wall perimeter for areas you plan to drywall
   Measure the length of each wall. Add all length figures together to obtain the total horizontal distance, or perimeter.

3. Ceiling width and length
   Omit if you do not plan to drywall your ceiling.

4. Excluded sections
   Measure the height and width of each area separately. Add all widths into one total. Add all heights into a second total.

5. Sloping walls
   Sloping walls form a triangular wall space. To calculate a triangle’s square footage, multiply the length of the wall at the base of the triangle by its height and divide by 2.

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