Project Tools

Drywall Calculator

Area Measurements
Walls (in ft.) Height x Room Perimeter
Ceiling (in ft.) Length x Width
Excluded Area (in ft.) Height x Width
Sloping Wall (in ft.) Height x Width
Total Drywall Area: sq. ft.
Total 4x8 Sheets You Need: sheet(s)


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.


Homeowner's Tip - Standard drywall sheets are 4 x 8 feet

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