How many sheets of drywall for a 8 × 12 ft room?
A 8 × 12 ft room with standard 8 ft walls and a flat ceiling needs about 14 sheets of 4 × 8 ft (32 sq ft) drywall — that covers the four walls and the ceiling, with one door and one window deducted and a 10% cutting allowance.
- Room
- 8 × 12 ft, 8 ft walls
- Net area
- 383 sq ft
- With allowance
- 421.3 sq ft
- Purchased
- 448 sq ft
- Leftover (est.)
- 65 sq ft
Based on 4 × 8 ft sheets (32 sq ft each), 8 ft walls, a 10% cutting allowance, and one standard door and window deducted.
Change the numbers in the drywall calculator →How this is worked out
Drywall calculator uses the same method as every tool here: measure the area, add a visible allowance, divide by what one sheet covers, and round up. The number above is the honest planning quantity — not an exact sheet layout. Confirm coverage on your product before buying.
buy = net area × (1 + allowance) ÷ per-sheet coverage → round up
Other sizes
Related
- Drywall calculator — change any number for your job
- Room material planner — every material on one shopping list
- Estimating for three walls, not four
- Drywall sizes and thickness
Frequently asked questions
How many sheets of drywall do I need for a 8 × 12 room?
About 14 sheets of 4 × 8 ft board for the walls and ceiling of a 8 × 12 ft room with 8 ft walls, after a 10% cutting allowance and deducting one door and one window. Net board area is about 383 sq ft.
What if the ceiling is not drywalled?
Untick the ceiling in the drywall calculator and it recalculates for walls only. The ceiling of a 8 × 12 room is about 96 sq ft of board on its own.
Does this include waste?
Yes — a 10% cutting allowance is already in the 14-sheet figure. You can change it in the calculator.