How many sheets of drywall do you actually need?
Enter your room's dimensions and get a precise answer in sheets — waste allowance included, no sign-up, no guessing.
Quick reference: common room sizes
Rough estimates at 8 ft ceilings, 4x8 ft sheets, one door and one window deducted, 10% waste. Use the calculator above for your exact numbers.
| Room size | Wall area | With waste | Sheets |
|---|---|---|---|
| Small bedroom (10 × 10 ft) | 284 sq ft | 312 sq ft | 10 |
| Standard bedroom (12 × 12 ft) | 348 sq ft | 383 sq ft | 12 |
| Living room (12 × 15 ft) | 396 sq ft | 436 sq ft | 14 |
| Large living room (14 × 16 ft) | 444 sq ft | 488 sq ft | 16 |
| Master bedroom (16 × 18 ft) | 508 sq ft | 559 sq ft | 18 |
Common questions
How many sheets of drywall do I need for a 12x12 room?
A 12×12 ft room with 8 ft ceilings has about 320 sq ft of wall area before doors and windows. At standard 4×8 ft sheets (32 sq ft each) with 10% waste, that's roughly 11 sheets for the walls, or about 16 if you're also sheeting the ceiling. Use the calculator above with your exact numbers for a precise figure.
What size drywall sheets should I use?
4×8 ft sheets are the standard — easiest to handle alone and they fit through most doorways. Larger 4×12 sheets mean fewer seams to tape and finish, which is faster on big open walls, but they're heavier and harder to maneuver solo.
How much waste should I allow for drywall?
10% is standard for a straightforward rectangular room. Rooms with lots of angles, alcoves, or a high number of windows and doors relative to wall area can need 15% or more.
Do I need drywall for the ceiling too?
Only if you're finishing an open ceiling, like in new construction or a gutted room. Most renovations that keep the existing ceiling only need wall sheets. Check the box above if your ceiling needs new drywall too.