Drywall Calculator
Estimate drywall materials for one room or a full remodel. Add multiple rooms, switch between dimensions or perimeter, subtract doors and windows, include ceilings, and see sheets, mud, tape, screws, corner bead, and cost instantly.
Rooms
Add each room, switch between perimeter and dimensions, and include ceilings when the room is also being boarded overhead.
Subtracts 21 sq ft each.
Subtracts 15 sq ft each.
Used for corner bead footage.
Perimeter
44.0 ft
Wall area
352.0 sq ft
Net board area
316.0 sq ft
Room
Room 1
Drywall Estimate
Total wall area
352.0 sq ft
Sheets needed
11
Joint compound
1 box
Total materials cost
$225.00
Tape rolls
1
Screws
2.25 lbs
Corner bead
32.0 ft
Adjusted board area
347.6 sq ft
Includes 0.0 sq ft of ceilings, subtracts 36.0 sq ft for doors and windows, and applies 10% waste using 4 × 8 sheets.
How to Use
- Add one or more rooms and choose whether to calculate from length × width or direct perimeter.
- Enter wall height, then adjust doors, windows, outside corners, and the ceiling toggle for each room.
- Select your drywall sheet size and set the waste factor for cuts, mistakes, and offcuts.
- Review total wall area, sheet count, joint compound, tape, screws, corner bead, and estimated materials cost.
Frequently Asked Questions
How many square feet does one drywall sheet cover?
A standard 4×8 sheet covers 32 square feet, a 4×10 sheet covers 40 square feet, and a 4×12 sheet covers 48 square feet. Larger sheets can reduce seams, but they are heavier and harder to handle.
How much waste should I add for drywall?
Around 10% waste is a common starting point for simple rooms. Complex layouts, many cutouts, vaulted ceilings, or first-time DIY installs may need 12% to 15% or more.
Should I subtract doors and windows from drywall area?
Yes. Subtracting large openings gives a more realistic material estimate. Many contractors still round up slightly because offcuts around openings can increase waste.
How much joint compound and tape do I need?
That depends on sheet count, seam layout, finishing level, and installer technique. This calculator provides a practical planning estimate, but detailed commercial takeoffs may vary by board orientation and finish spec.