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Drywall Calculator

Calculate sheets, joint compound, tape, and screws for a full room.

This drywall calculator will help you determine the number of materials you'll need to drywall a room, including drywall sheets, joint compound, tape, and screws. Our drywall material calculator accounts for ceilings, doors, windows, and 10% waste factor.With the help of Houzz Pro software’s pre-priced material Cost Catalog, or by linking your preferred vendor websites with the Clipper tool, you can save time on your estimates, giving you more time to run your business.

How do I calculate how much drywall I’ll need?

To calculate how much drywall you’ll need for a room, you must measure the length and height of each wall, the ceiling area, and the area of all doors and windows. Add up the surface areas of all the walls and the ceiling, then subtract the area taken up by doors and windows. The number of sheets you’ll need is determined by dividing the coverage area by 32 for 4’x8’ sheets or by 48 for 4’x12’ sheets.
Drywall formula = (Surface area of walls + surface area of ceiling – surface area of doors and windows) / square footage of drywall sheets
You’ll want to include a waste factor of 10-20% depending on the complexity of the wall layout.

Drywall material calculator

Besides estimating the number of drywall sheets you’ll need, our calculator also provides estimates for the number of screws, rolls of tape, and buckets of joint compound, as well as a material cost estimate.Here’s an example showing how our drywall material cost calculator works:Calculator inputs:
  • Room length: 16 feet
  • Room width: 12 feet
  • Ceiling height: 8 feet
  • Number of doors: 2
  • Number of windows: 1
  • Sheet size: 4x8 (32 square feet)
  • Price per sheet: $20
Based on the inputs above, the calculator estimates the material cost for drywall, compound, tape, and screws at $280. Here’s the material breakdown:
  • Wall area: 391 square feet
  • Drywall sheets with 10% waste: 14
  • Joint compound: 1 bucket
  • Drywall tape: 1 roll
  • Screws: Approximately 448
By using Houzz Pro’s built-in Cost Catalog and Clipper tools, you can save time and improve the accuracy of your project estimates, giving you more time to spend on winning work.

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