Walls (in ft.)
Ceiling (in ft.)
Excluded Area (in ft.)
Slopping Wall (in ft.)

Tips on Measuring for Drywall

Before you begin, take the room measurements in the list below round to the nearest foot. If you have sloping walls, follow the special case instructions on how to determine this square footage. A 10 percent waste allowance is automatically added to the total.

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.

For more on drywall prices, visit our Drywall Hanging Cost Guide.

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  1. richard lee lambert, January 9:

    We got living room to Kitchen I need to know how many pieces of sheetrock I need 14 foot wide by 40 foot long

  2. Adam, March 22:

    I’m wondering how many 12 ft sheets of drywall I’d need for a wall 25 ft x 80 ft

  3. Geovanni canas, October 8:

    Hi, excuse me, I have 2330 square feet in a two-story apartment, how many drywall sheets will I have to buy?

  4. HomeAdvisor, October 12:

    Hi Geovanni – Our True Cost Guide has some information that may be useful in answering your question.

  5. Ray Trujillo, May 9:

    Need to know how much dry wall needed for a 340 square ft room; with an 8 ft height ceiling.

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