Drywall calculator
Enter the room and the sheet size. Jobmath removes doors and windows and adds extra for cuts.
How it's calculated
Each step, in the order Jobmath runs it.
| Step | Formula |
|---|---|
| Wall area | 2 × (length + width) × wall height |
| Ceiling area | Length × width |
| Area to cover | Walls + ceiling − doors and windows |
| Sheets | Area × (1 + waste %) ÷ sheet area, rounded up |
Sheet sizes
Longer sheets mean fewer seams to tape and finish.
| Sheet | Area | Common use |
|---|---|---|
| 4' × 8' | 32 sq ft | Walls up to 8 ft, easiest to carry |
| 4' × 10' | 40 sq ft | 9 and 10 ft walls |
| 4' × 12' | 48 sq ft | Fewer seams on long walls and ceilings |
| 4.5' × 12' | 54 sq ft | 9 ft walls hung horizontally, two rows |