Free contractor calculator
Drywall Calculator
Enter a room's dimensions and this calculator returns the drywall area, the number of 4×8 or 4×12 sheets to order with waste, and the joint compound and screws to finish it. The same square-foot-to-sheet conversion JobPlumb uses on a takeoff.
Your measurements
Result
- 4×8 sheets
- 24sheets
- Drywall area
- 696sq ft
- Joint compound
- 7gal
- Screws
- 768 · 2.6 lb
How this is calculated
Area
2 × (length + width) × height, plus length × width if ceiling included
Sheets
area × (1 + waste %) ÷ 32 sq ft per sheet, rounded up
Compound
≈ 1 gallon of all-purpose compound per 100 sq ft (tape + 3 coats)
Screws
≈ 32 screws per sheet; ≈ 300 drywall screws per pound
Taking this off a real plan?
JobPlumb measures slabs, walls, roofs and runs straight off your drawings, then prices the job and sends a proposal your client accepts online. Free to start, no install.
See JobPlumb estimatingHow to use it
- 1Enter the room dimensions and choose whether to include the ceiling.
- 2Pick your sheet size: 4×8 or 4×12.
- 3Set a waste allowance (10% is typical).
- 4Read the sheets, joint compound and screws to buy.
Drywall Calculator, answered
Add the wall area (perimeter × height) and the ceiling area (length × width), add about 10% for waste, then divide by the sheet area (32 sq ft for a 4×8 or 48 for a 4×12) and round up.
Measure it off the real plan in JobPlumb.
Free to start. No install, no sales call. Works in any browser.