Drywall Calculator
Work out exactly how many sheets of drywall, screws, joint tape, and joint compound you need for your room. Enter your dimensions below for an instant, easy-to-follow materials estimate.
Calculate Your Drywall Needs
Enter your room’s dimensions and openings to see a full materials breakdown, including sheets, screws, joint tape, and joint compound, rounded up with a sensible waste allowance.
Room & Sheet Details
Enter your room’s measurements
Materials Estimate
Estimated drywall and finishing supplies needed
Standard Drywall Estimating Rules
Common rules of thumb used by installers to estimate drywall materials for a typical room.
| Material | Coverage Rule | Standard Rate |
|---|---|---|
| Drywall Sheet | Standard 4 ft x 8 ft sheet | 32 sq ft / sheet |
| Drywall Screws | Spaced ~16 inches on studs | ~32 screws / sheet |
| Joint Compound | Basic three-coat finish | ~1 gallon / 100 sq ft |
| Joint Tape | Seams & inside corners | ~370 ft / 1,000 sq ft |
| Standard Door Opening | Deducted from wall area | ~21 sq ft |
| Standard Window Opening | Deducted from wall area | ~15 sq ft |
Drywall Estimating FAQ
Everything you need to know about estimating drywall, screws, tape, and joint compound for your project.
Add up the total square footage of all the walls and ceilings you’re covering, then divide by the square footage of a single drywall sheet (a standard 4×8 sheet covers 32 square feet). Round up and add a waste allowance of around 10-15% to cover cuts and mistakes.
As a general rule, plan for around 32 screws per standard 4×8 sheet of drywall on walls, spaced roughly every 16 inches along the studs. Ceilings typically need a slightly tighter spacing to prevent sagging.
A standard rule of thumb is one gallon of joint compound for every 100 square feet of drywall for a basic three-coat finish. Larger jobs or a smoother finish level may require more.
You’ll typically need about 370 feet of joint tape for every 1,000 square feet of drywall, which covers both the seams between sheets and the inside corners of the room.
Yes, it’s best to subtract the area of doors and large windows from your total wall area since drywall isn’t needed there. However, many installers skip subtracting small openings to keep a small buffer of extra material for cuts and waste.