How Much Drywall Do I Need?
The number of drywall sheets depends on your total wall (and ceiling) area and the sheet size. A standard 4×8 sheet covers 32 sq ft — add 12% waste for cuts and edges.
18 years · Licensed GC · OSHA 30
Tom has built and renovated over 400 residential projects across the Mid-Atlantic. He specializes in concrete, framing, and exterior hardscape.
Drywall Calculator — sheets, joint compound, and tape
Enter your exact dimensions for a personalized estimate →
The quick formula
Sheets = ceil(Net wall area × 1.12 ÷ sheet sq ft)
Sheet size reference
| Sheet size | Sq ft | Sheets per 100 sq ft (12% waste) |
|---|---|---|
| 4 × 8 ft | 32 sq ft | 4 sheets |
| 4 × 12 ft | 48 sq ft | 3 sheets |
| 4 × 16 ft | 64 sq ft | 2 sheets |
Sheets needed by room (4×8 sheets, 8 ft ceiling, 12% waste)
| Room | Wall area | Sheets (walls only) | Add for ceiling |
|---|---|---|---|
| 8 × 10 ft | 288 sq ft | 10 sheets | +3 sheets |
| 10 × 12 ft | 352 sq ft | 13 sheets | +4 sheets |
| 12 × 12 ft | 384 sq ft | 14 sheets | +5 sheets |
| 12 × 16 ft | 448 sq ft | 16 sheets | +7 sheets |
Supplies per 100 sq ft of drywall
| Supply | Estimate |
|---|---|
| Joint compound | 1 gallon (3 coats) |
| Drywall tape | 1 roll (75 ft) per 3 sheets |
| Drywall screws (1 lb) | ~35 per 4×8 sheet |
How to measure
- Each wall: length × ceiling height in feet
- Add all walls: total wall area
- Add ceiling if needed: room length × width
- Subtract openings (optional): 21 sq ft per door, 15 sq ft per window
- Apply 12% waste
Use the Drywall Calculator for your exact room dimensions with automatic door/window deduction.
Frequently Asked Questions
How many sheets of drywall do I need for a 12×12 room?
A 12×12 room with 8-foot ceilings has about 384 sq ft of wall area. After subtracting 1 door and 2 windows (57 sq ft), net area is 327 sq ft. With 12% waste and 4×8 sheets (32 sq ft each), you need 12 sheets. Add 3 more for the ceiling (144 sq ft ÷ 32 = 5 sheets).
How many sheets of drywall come in a bundle?
Drywall is typically sold by the sheet individually at home improvement stores. Delivered orders may come in bundles of 2 sheets (face-to-face). You can usually order any quantity.
Should I use 4×8 or 4×12 drywall sheets?
4×8 sheets are standard and easiest to handle. 4×12 sheets create fewer seams (which means less taping and finishing work) but are heavier and harder to lift alone — especially for ceilings. Most DIYers use 4×8.
How much joint compound do I need for drywall?
As a rough estimate, plan on about 1 gallon of joint compound per 100 sq ft of drywall for 3 coats (tape coat, filler coat, finish coat). A 5-gallon bucket covers about 500 sq ft of drywall.
Do I subtract doors and windows from my drywall calculation?
You can, but most contractors do not make large deductions — the cutouts become usable pieces for corners and other areas. The calculator makes the deduction as an option, but add some back in for partial sheets used elsewhere.
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