Part of the Construction collection — 4 tools available
Drywall Calculator
Estimate how many sheets of drywall, screws, and joint compound you need for any room. Accounts for walls, ceiling, doors, and windows.
About This Calculator
Hanging drywall is one of the most satisfying phases of a remodel — if you have all the materials on hand when you start. Run out of sheets mid-wall and the entire project stops until you can get back to the supplier. But drywall math isn't just about wall area; you need to subtract door and window openings, decide whether the ceiling gets drywall too, and estimate screws and joint compound. Our drywall calculator measures your room, subtracts standard openings, and tells you exactly how many 4*8 sheets, screws, and gallons of joint compound to buy.
The Formula Behind This Calculator
Net area = Wall area - Doors (20 sq ft each) - Windows (15 sq ft each) Sheets = Net area / 32 (4*8 sheet) Sheets w/ waste = Sheets * 1.1
Understanding the math helps you verify results and make better decisions for your project.
Related Tools
How to Use
- 1Enter room dimensions and ceiling height.
- 2Count the number of doors and windows to subtract from wall area.
- 3Choose whether to include the ceiling.
- 4Enter the price per 4*8 sheet.
- 5Click Calculate for sheets, screws, mud, and cost.
When to Use
- →Estimating drywall materials for a basement finishing or room addition project
- →Budgeting a complete drywall job including sheets, screws, tape, and joint compound
- →Comparing the cost of doing drywall yourself vs hiring a drywall contractor
Tips
- ✓Hang drywall horizontally on walls — it reduces the number of seams at eye level and is stronger
- ✓Use 5/8-inch Type X drywall on ceilings and between garages and living spaces for fire rating
- ✓Mark stud locations on the floor and ceiling before hanging so you can find them when finishing seams
FAQ
Should I use 1/2" or 5/8" drywall?
1/2" is standard for walls. Use 5/8" for ceilings (sags less) and for fire-rated walls between living spaces and garages.
How many screws per sheet of drywall?
About 32 screws per 4×8 sheet — placed every 12" on edges and in the field on 16" stud centers.
How much joint compound do I need?
Roughly 1 gallon of all-purpose mud per 8 sheets for taping and finishing with 3 coats.
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